Build an Application: Step-by-Step #8 Exercise to Accompany Interfaces 101

RE: Build an Application: Step-by-Step #8 Exercise to Accompany Interfaces 101

stepehenl826500 — Mon, 28 Apr 2025 15:29:30 GMT

I also got a similar problem.

My errors were on lines 355 and 483

It may be that I was messing around with something, or versions changed but got a error for "a!gridField"

"Interface Definition: Expression evaluation error at function a!gridField [line 335]: A grid component [label="Maintenance"] has an invalid value for "columns". A grid column [label="Created"] has encountered an error. Expression evaluation error at function 'user' [line 463]: [InvalidUserException]"

a!headerContentLayout(
  contents: {
    a!columnsLayout(
      columns: {
        a!columnLayout(
          showWhen: a!isPageWidth({ "DESKTOP", "DESKTOP_WIDE" }),
          contents: {}
        ),
        a!columnLayout(
          width: "WIDE",
          contents: {
            a!sectionLayout(
              label: "Details",
              labelSize: "MEDIUM",
              labelColor: "STANDARD",
              contents: {
                a!cardLayout(
                  contents: {
                    a!columnsLayout(
                      columns: {
                        a!columnLayout(
                          contents: {
                            a!richTextDisplayField(
                              label: "Make",
                              value: {
                                a!defaultValue(
                                  ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.fields.{ba6e0fe6-4a7b-42b1-9270-59b975a99a55}make'],
                                  "–"
                                )
                              }
                            )
                          }
                        ),
                        a!columnLayout(
                          contents: {
                            a!richTextDisplayField(
                              label: "Model",
                              value: {
                                a!defaultValue(
                                  ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.fields.{e67f4174-c11b-4415-af79-f4562ed79ed3}model'],
                                  "–"
                                )
                              }
                            )
                          }
                        ),
                        a!columnLayout(
                          contents: {
                            a!richTextDisplayField(
                              label: "Color",
                              value: {
                                a!defaultValue(
                                  ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.fields.{3b6a9c52-9e2e-4091-ba6d-ed61aa32f5a7}color'],
                                  "–"
                                )
                              }
                            )
                          }
                        )
                      }
                    ),
                    a!columnsLayout(
                      columns: {
                        a!columnLayout(
                          contents: {
                            a!richTextDisplayField(
                              label: "Vehicle Condition",
                              value: {
                                a!defaultValue(
                                  ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.relationships.{c398cf16-a0e7-47ec-8e7d-0b243fe100d1}vehicleCondition.fields.{374df96f-5bb5-4f8b-aafe-d86f8b3b00ee-w1723aa}value'],
                                  "–"
                                )
                              }
                            )
                          }
                        ),
                        a!columnLayout(
                          contents: {
                            a!richTextDisplayField(
                              label: "Vehicle Status",
                              value: {
                                a!defaultValue(
                                  ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.relationships.{c8ec3169-403c-42e1-b687-ba64fb471d78}vehicleStatus.fields.{ba580c3e-2697-4c62-919b-db8a9d440572-w1723aa}value'],
                                  "–"
                                )
                              }
                            )
                          }
                        ),
                        a!columnLayout(
                          contents: {
                            a!richTextDisplayField(
                              label: "Vehicle Category",
                              value: {
                                a!defaultValue(
                                  ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.relationships.{3dd9f56a-7dd2-4cbf-86fd-76cf41083399}vehicleCategory.fields.{8587ac12-bc92-4a00-bad1-20d227b29766-w1723aa}value'],
                                  "–"
                                )
                              }
                            )
                          }
                        )
                      },
                      marginAbove: "STANDARD"
                    ),
                    a!columnsLayout(
                      columns: {
                        a!columnLayout(
                          contents: {
                            a!richTextDisplayField(
                              label: "Mileage",
                              value: {
                                a!defaultValue(
                                  ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.fields.{8e8a26a1-2666-431b-a7d8-a0fe45254662}mileage'],
                                  "–"
                                )
                              }
                            )
                          }
                        ),
                        a!columnLayout(
                          contents: {
                            a!richTextDisplayField(
                              label: "Year",
                              value: {
                                a!defaultValue(
                                  ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.fields.{1195975c-0ce7-4529-93eb-868e2dc36803}year'],
                                  "–"
                                )
                              }
                            )
                          }
                        ),
                        a!columnLayout(
                          contents: {
                            a!richTextDisplayField(
                              label: "Last Maintenance Date",
                              value: {
                                if(
                                  isnull(
                                    ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.fields.{f52b1860-5535-4e60-9b4d-57fa87f15a63}lastMaintenanceDate']
                                  ),
                                  "–",
                                  {
                                    a!richTextIcon(
                                      icon: "calendar",
                                      color: "SECONDARY"
                                    ),
                                    " ",
                                    a!richTextItem(
                                      text: text(
                                        ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.fields.{f52b1860-5535-4e60-9b4d-57fa87f15a63}lastMaintenanceDate'],
                                        "mmmm d, yyyy"
                                      )
                                    )
                                  }
                                )
                              }
                            )
                          }
                        )
                      },
                      marginAbove: "STANDARD"
                    ),
                    a!columnsLayout(
                      columns: {
                        a!columnLayout(
                          contents: {
                            a!richTextDisplayField(
                              label: "Next Maintenance Date",
                              value: {
                                if(
                                  isnull(
                                    ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.fields.{e2239d09-3a42-4185-95b9-047b9ee9887c}nextMaintenanceDate']
                                  ),
                                  "–",
                                  {
                                    a!richTextIcon(
                                      icon: "calendar",
                                      color: "SECONDARY"
                                    ),
                                    " ",
                                    a!richTextItem(
                                      text: text(
                                        ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.fields.{e2239d09-3a42-4185-95b9-047b9ee9887c}nextMaintenanceDate'],
                                        "mmmm d, yyyy"
                                      )
                                    )
                                  }
                                )
                              }
                            )
                          }
                        ),
                        a!columnLayout(
                          contents: {
                            a!richTextDisplayField(
                              label: "Image",
                              value: {
                                a!defaultValue(
                                  ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.fields.{26cc839e-6b1c-4e1b-8a68-1b0345566608}image'],
                                  "–"
                                )
                              }
                            )
                          }
                        ),
                        a!columnLayout(
                          contents: {
                            a!richTextDisplayField(
                              label: "Added On",
                              value: {
                                if(
                                  isnull(
                                    ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.fields.{2a25f368-3dce-4251-b39d-e230b4fec16c}addedOn']
                                  ),
                                  "–",
                                  {
                                    a!richTextIcon(
                                      icon: "calendar",
                                      color: "SECONDARY"
                                    ),
                                    " ",
                                    a!richTextItem(
                                      text: text(
                                        ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.fields.{2a25f368-3dce-4251-b39d-e230b4fec16c}addedOn'],
                                        "mmmm d, yyyy"
                                      )
                                    )
                                  }
                                )
                              }
                            )
                          }
                        )
                      },
                      marginAbove: "STANDARD"
                    ),
                    a!columnsLayout(
                      columns: {
                        a!columnLayout(
                          contents: {
                            a!richTextDisplayField(
                              label: "Modified On",
                              value: {
                                if(
                                  isnull(
                                    ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.fields.{7a484c31-86d5-4f60-9f07-09f407f6a454}modifiedOn']
                                  ),
                                  "–",
                                  {
                                    a!richTextIcon(
                                      icon: "calendar",
                                      color: "SECONDARY"
                                    ),
                                    " ",
                                    a!richTextItem(
                                      text: text(
                                        ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.fields.{7a484c31-86d5-4f60-9f07-09f407f6a454}modifiedOn'],
                                        "mmmm d, yyyy"
                                      )
                                    )
                                  }
                                )
                              }
                            )
                          }
                        ),
                        a!columnLayout(
                          contents: {
                            a!richTextDisplayField(
                              label: "Mileage Category",
                              value: {
                                a!defaultValue(
                                  ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.fields.{34460c78-df10-42c2-a266-5226c3eb8fff}mileageCategory'],
                                  "–"
                                )
                              }
                            )
                          }
                        ),
                        a!columnLayout(
                          contents: {
                            a!richTextDisplayField(
                              label: "Cost Sum",
                              value: {
                                a!defaultValue(
                                  ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.fields.{7fe7a504-79e9-4edb-87da-ba834becda36}costSum'],
                                  "–"
                                )
                              }
                            )
                          }
                        )
                      },
                      marginAbove: "STANDARD"
                    ),
                    a!columnsLayout(
                      columns: {
                        a!columnLayout(
                          contents: {
                            a!richTextDisplayField(
                              label: "Count Of Maintenance Requests",
                              value: {
                                a!defaultValue(
                                  ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.fields.{679064a6-0316-4f76-ab9d-b1e82b429a77}countOfMaintenanceRequests'],
                                  "–"
                                )
                              }
                            )
                          }
                        ),
                        a!columnLayout(
                          contents: {}
                        ),
                        a!columnLayout(
                          contents: {}
                        )
                      },
                      marginAbove: "STANDARD"
                    )
                  },
                  shape: "SEMI_ROUNDED",
                  padding: "STANDARD"
                )
              },
              marginBelow: "MORE"
            ),
            a!sectionLayout(
              label: "Maintenance Requests",
              labelSize: "MEDIUM",
              labelColor: "STANDARD",
              contents: {
                a!cardLayout(
                  contents: {
                    a!gridField(
                      label: "Maintenance",
                      labelPosition: "COLLAPSED",
                      data: a!recordData(
                        recordType: 'recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance',
                        filters: a!queryLogicalExpression(
                          operator: "AND",
                          filters: {
                            a!queryFilter(
                              field: 'recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{fbe2fbaf-1f4b-4236-bdee-e7483489e1d4}vehicleId',
                              operator: "=",
                              value: ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.fields.{4c320105-f1c9-4f22-9c25-aa4ad3ae55d1}id']
                            )
                          },
                          ignoreFiltersWithEmptyValues: true
                        )
                      ),
                      columns: {
                        a!gridColumn(
                          label: "Id",
                          sortField: 'recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{3069fe29-b121-414e-98bc-fda3810ff7ab}id',
                          value: a!richTextDisplayField(
                            value: {
                              a!richTextItem(
                                text: if(
                                  fv!row['recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{3069fe29-b121-414e-98bc-fda3810ff7ab}id'] < 100000,
                                  text(
                                    fv!row['recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{3069fe29-b121-414e-98bc-fda3810ff7ab}id'],
                                    "#00000"
                                  ),
                                  fv!row['recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{3069fe29-b121-414e-98bc-fda3810ff7ab}id']
                                ),
                                link: a!recordLink(
                                  recordType: 'recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance',
                                  identifier: fv!identifier
                                ),
                                linkStyle: "STANDALONE"
                              )
                            }
                          )
                        ),
                        a!gridColumn(
                          label: "Vehicle Id",
                          sortField: 'recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{fbe2fbaf-1f4b-4236-bdee-e7483489e1d4}vehicleId',
                          value: a!defaultValue(fv!row['recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{fbe2fbaf-1f4b-4236-bdee-e7483489e1d4}vehicleId'], "–"),
                          align: "END"
                        ),
                        a!gridColumn(
                          label: "Issue",
                          sortField: 'recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{34e3bcf0-b3ad-4e7b-b438-3fdfbba9c309}issue',
                          value: a!defaultValue(fv!row['recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{34e3bcf0-b3ad-4e7b-b438-3fdfbba9c309}issue'], "–")
                        ),
                        a!gridColumn(
                          label: "Is Scheduled",
                          sortField: 'recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{59a1d4b0-e3d5-44dd-a38f-90506d973e8a}isScheduled',
                          value: if(
                            isnull(fv!row['recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{59a1d4b0-e3d5-44dd-a38f-90506d973e8a}isScheduled']),
                            "–",
                            a!richTextDisplayField(
                              value: if(
                                fv!row['recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{59a1d4b0-e3d5-44dd-a38f-90506d973e8a}isScheduled'],
                                a!richTextIcon(
                                  icon: "check",
                                  altText: "Yes",
                                  color: "#138901"
                                ),
                                a!richTextIcon(
                                  icon: "times",
                                  altText: "No",
                                  color: "SECONDARY"
                                )
                              )
                            )
                          ),
                          align: "CENTER"
                        ),
                        a!gridColumn(
                          label: "Status",
                          sortField: 'recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{3dffcf38-8580-4570-8aae-e83c26461ef0}status',
                          value: a!defaultValue(fv!row['recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{3dffcf38-8580-4570-8aae-e83c26461ef0}status'], "–")
                        ),
                        a!gridColumn(
                          label: "Start Date",
                          sortField: 'recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{d4585653-61fe-408f-9bda-d629723b7d64}startDate',
                          value: a!defaultValue(fv!row['recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{d4585653-61fe-408f-9bda-d629723b7d64}startDate'], "–"),
                          align: "END"
                        ),
                        a!gridColumn(
                          label: "End Date",
                          sortField: 'recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{cc9ca837-f3cc-4ea8-b3c1-6ed7c7808246}endDate',
                          value: a!defaultValue(fv!row['recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{cc9ca837-f3cc-4ea8-b3c1-6ed7c7808246}endDate'], "–"),
                          align: "END"
                        ),
                        a!gridColumn(
                          label: "Cost",
                          sortField: 'recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{ed6d49b7-8bcf-454c-9d3b-aa6f0549d100}cost',
                          value: a!defaultValue(fv!row['recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{ed6d49b7-8bcf-454c-9d3b-aa6f0549d100}cost'], "–"),
                          align: "END"
                        ),
                        a!gridColumn(
                          label: "Assigned Mechanic",
                          sortField: 'recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{d26b779c-2cad-4a57-b16a-a6e2588a1007}assignedMechanic',
                          value: a!defaultValue(fv!row['recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{d26b779c-2cad-4a57-b16a-a6e2588a1007}assignedMechanic'], "–")
                        ),
                        a!gridColumn(
                          label: "Created",
                          sortField: 'recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{356fd463-0c66-4bcb-8051-ddf97ed25b27}createdOn',
                          value: a!richTextDisplayField(
                            value: a!localVariables(
                              local!isUserValueBlank: isnull(fv!row['recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{e14b9708-08c0-4dc5-8e88-4d886ae81478}createdBy']),
                              local!isTimeValueBlank: isnull(fv!row['recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{356fd463-0c66-4bcb-8051-ddf97ed25b27}createdOn']),
                              if(
                                and(
                                  local!isUserValueBlank,
                                  local!isTimeValueBlank
                                ),
                                "–",
                                {
                                  if(
                                    local!isTimeValueBlank,
                                    "–",
                                    datetext(fv!row['recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{356fd463-0c66-4bcb-8051-ddf97ed25b27}createdOn'], "default")
                                  ),
                                  char(10),
                                  a!richTextItem(
                                    text: if(
                                      local!isUserValueBlank,
                                      "–",
                                      user(fv!row['recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{e14b9708-08c0-4dc5-8e88-4d886ae81478}createdBy'], "firstName") & " " & user(fv!row['recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{e14b9708-08c0-4dc5-8e88-4d886ae81478}createdBy'], "lastName")
                                    ),
                                    color: "SECONDARY"
                                  )
                                }
                              )
                            )
                          ),
                          align: "START",
                          width: "NARROW_PLUS"
                        ),
                        a!gridColumn(
                          label: "Modified",
                          sortField: 'recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{2f6c2b81-a28c-4b4a-92c6-4c43f6d3dd20}modifiedOn',
                          value: a!richTextDisplayField(
                            value: a!localVariables(
                              local!isUserValueBlank: isnull(fv!row['recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{724412f1-36fe-439e-9191-e5e2beb2f103}modifiedBy']),
                              local!isTimeValueBlank: isnull(fv!row['recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{2f6c2b81-a28c-4b4a-92c6-4c43f6d3dd20}modifiedOn']),
                              if(
                                and(
                                  local!isUserValueBlank,
                                  local!isTimeValueBlank
                                ),
                                "–",
                                {
                                  if(
                                    local!isTimeValueBlank,
                                    "–",
                                    datetext(fv!row['recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{2f6c2b81-a28c-4b4a-92c6-4c43f6d3dd20}modifiedOn'], "default")
                                  ),
                                  char(10),
                                  a!richTextItem(
                                    text: if(
                                      local!isUserValueBlank,
                                      "–",
                                      user(fv!row['recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{724412f1-36fe-439e-9191-e5e2beb2f103}modifiedBy'], "firstName") & " " & user(fv!row['recordType!{06a597bb-9238-4521-b602-0d194ccf176a}W1723SA Maintenance.fields.{724412f1-36fe-439e-9191-e5e2beb2f103}modifiedBy'], "lastName")
                                    ),
                                    color: "SECONDARY"
                                  )
                                }
                              )
                            )
                          ),
                          align: "START",
                          width: "NARROW_PLUS"
                        )
                      },
                      pageSize: 5,
                      rowHeader: 1,
                      showSearchBox: true,
                      showRefreshButton: true,
                      borderStyle: "LIGHT",
                      shadeAlternateRows: false,
                      refreshAfter: "RECORD_ACTION"
                    )
                  },
                  shape: "SEMI_ROUNDED",
                  padding: "STANDARD"
                )
              },
              marginBelow: "MORE"
            )
          }
        ),
        a!columnLayout(
          width: "MEDIUM",
          contents: {
            a!sectionLayout(
              label: "Contacts",
              labelSize: "MEDIUM",
              labelColor: "STANDARD",
              contents: {
                a!cardLayout(
                  contents: {
                    a!sideBySideLayout(
                      items: {
                        a!sideBySideItem(
                          width: "MINIMIZE",
                          item: a!imageField(
                            labelPosition: "COLLAPSED",
                            size: "EXTRA_SMALL",
                            style: "AVATAR",
                            images: a!userImage(
                              user: ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.fields.{2ad68743-f42e-4bb1-84cc-97660d9d0b6d}addedBy']
                            )
                          )
                        ),
                        a!sideBySideItem(
                          item: a!richTextDisplayField(
                            labelPosition: "COLLAPSED",
                            value: {
                              if(
                                a!isNullOrEmpty(ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.fields.{2ad68743-f42e-4bb1-84cc-97660d9d0b6d}addedBy']),
                                a!richTextItem(
                                  text: {
                                    "-"
                                  }
                                ),
                                a!richTextItem(
                                  text: {
                                    user(
                                      ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.fields.{2ad68743-f42e-4bb1-84cc-97660d9d0b6d}addedBy'],
                                      "firstName"
                                    ) & " " & user(
                                      ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.fields.{2ad68743-f42e-4bb1-84cc-97660d9d0b6d}addedBy'],
                                      "lastName"
                                    )
                                  },
                                  color: "ACCENT",
                                  style: {
                                    "STRONG"
                                  }
                                )
                              ),
                              char(10),
                              a!richTextItem(
                                text: {
                                  "Added By"
                                },
                                color: "SECONDARY"
                              )
                            }
                          )
                        )
                      },
                      alignVertical: "MIDDLE"
                    )
                  },
                  shape: "SEMI_ROUNDED",
                  padding: "LESS",
                  marginBelow: "STANDARD",
                  link: if(
                    a!isNullOrEmpty(ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.fields.{2ad68743-f42e-4bb1-84cc-97660d9d0b6d}addedBy']),
                    null,
                    a!userRecordLink(
                      user: ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.fields.{2ad68743-f42e-4bb1-84cc-97660d9d0b6d}addedBy']
                    )
                  )
                ),
                a!cardLayout(
                  contents: {
                    a!sideBySideLayout(
                      items: {
                        a!sideBySideItem(
                          width: "MINIMIZE",
                          item: a!imageField(
                            labelPosition: "COLLAPSED",
                            size: "EXTRA_SMALL",
                            style: "AVATAR",
                            images: a!userImage(
                              user: ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.fields.{6deea7c8-43fc-46ad-8f5a-173198319916}modifiedBy']
                            )
                          )
                        ),
                        a!sideBySideItem(
                          item: a!richTextDisplayField(
                            labelPosition: "COLLAPSED",
                            value: {
                              if(
                                a!isNullOrEmpty(ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.fields.{6deea7c8-43fc-46ad-8f5a-173198319916}modifiedBy']),
                                a!richTextItem(
                                  text: {
                                    "-"
                                  }
                                ),
                                a!richTextItem(
                                  text: {
                                    user(
                                      ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.fields.{6deea7c8-43fc-46ad-8f5a-173198319916}modifiedBy'],
                                      "firstName"
                                    ) & " " & user(
                                      ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.fields.{6deea7c8-43fc-46ad-8f5a-173198319916}modifiedBy'],
                                      "lastName"
                                    )
                                  },
                                  color: "ACCENT",
                                  style: {
                                    "STRONG"
                                  }
                                )
                              ),
                              char(10),
                              a!richTextItem(
                                text: {
                                  "Modified By"
                                },
                                color: "SECONDARY"
                              )
                            }
                          )
                        )
                      },
                      alignVertical: "MIDDLE"
                    )
                  },
                  shape: "SEMI_ROUNDED",
                  padding: "LESS",
                  marginBelow: "STANDARD",
                  link: if(
                    a!isNullOrEmpty(ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.fields.{6deea7c8-43fc-46ad-8f5a-173198319916}modifiedBy']),
                    null,
                    a!userRecordLink(
                      user: ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.fields.{6deea7c8-43fc-46ad-8f5a-173198319916}modifiedBy']
                    )
                  )
                )
              },
              marginBelow: "MORE"
            ),
            a!sectionLayout(
              label: "Event History",
              labelSize: "MEDIUM",
              labelColor: "STANDARD",
              contents: {
                a!cardLayout(
                  contents: {
                    a!eventHistoryListField(
                      eventStyle: "LIST_WITH_COMMENTS",
                      labelPosition: "COLLAPSED",
                      refreshAfter: "RECORD_ACTION",
                      commentLayout: "LIST",
                      commentCardColor: "TRANSPARENT",
                      pageSize: 3,
                      displayUser: "IMAGE",
                      showSearchBox: false,
                      showReverseSortButton: false,
                      eventData: a!eventData(
                        recordType: 'recordType!{ff4018bf-fa55-4fd0-b918-3453180a59c9}W1723SA Vehicle Event History',
                        user: 'recordType!{ff4018bf-fa55-4fd0-b918-3453180a59c9}W1723SA Vehicle Event History.fields.{8b13ce1d-262f-4ee4-8411-7d23964dda0e}user',
                        timestamp: 'recordType!{ff4018bf-fa55-4fd0-b918-3453180a59c9}W1723SA Vehicle Event History.fields.{f0318429-9860-4696-9d21-d62b231cca67}timestamp',
                        comment: 'recordType!{ff4018bf-fa55-4fd0-b918-3453180a59c9}W1723SA Vehicle Event History.fields.{075a1011-5f45-4b8b-9ce6-52a136c0891e}comment',
                        allowUsersToComment: true,
                        allowUsersToReply: false,
                        baseRecordIdForComment: ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.fields.{4c320105-f1c9-4f22-9c25-aa4ad3ae55d1}id'],
                        eventTypeName: fv!data['recordType!{ff4018bf-fa55-4fd0-b918-3453180a59c9}W1723SA Vehicle Event History.relationships.{61e2ce01-b53b-46df-bebd-f3f857b675b5}eventType.fields.{bf85052c-79bc-4d28-9a85-d25b65df15d4}eventName'],
                        filters: a!queryFilter(
                          field: 'recordType!{ff4018bf-fa55-4fd0-b918-3453180a59c9}W1723SA Vehicle Event History.fields.{68cdeaa8-9a49-476c-b65f-f577c85a4bf4}recordId',
                          operator: "=",
                          value: ri!record['recordType!{e398ddee-7860-456b-9ed4-7a29735217bd}W1723SA Vehicle.fields.{4c320105-f1c9-4f22-9c25-aa4ad3ae55d1}id']
                        )
                      )
                    )
                  },
                  shape: "SEMI_ROUNDED",
                  padding: "LESS"
                )
              },
              marginBelow: "MORE"
            )
          }
        ),
        a!columnLayout(
          showWhen: a!isPageWidth({ "DESKTOP", "DESKTOP_WIDE" }),
          contents: {}
        )
      },
      marginAbove: "MORE",
      spacing: "SPARSE",
      stackWhen: {
        "TABLET_PORTRAIT",
        "PHONE"
      }
    )
  },
  backgroundColor: "#fbfbfb"
)

RE: Build an Application: Step-by-Step #8 Exercise to Accompany Interfaces 101

Travis Schettler — Thu, 24 Apr 2025 03:53:32 GMT

As was suggested, I tried using the a!usernametaken() function, but it didn't work for me. I did find a different a fix for this issue: For the Created and Modified grid columns, change the "createdBy" and "modifiedBy" field references to the "createdByUser" and "modifiedByUser" relationships instead. Once I did this, the interface loaded just fine.

RE: Build an Application: Step-by-Step #8 Exercise to Accompany Interfaces 101

Vyshnavi Naripeddi — Mon, 14 Apr 2025 06:03:21 GMT

As you are the only user and no others users mentioned in the created by column were active, I suggest you to follow the same approach that I have mentioned above.

RE: Build an Application: Step-by-Step #8 Exercise to Accompany Interfaces 101

jacobb122 — Thu, 10 Apr 2025 15:53:15 GMT

absolutely
hopefully this is helpful

I realize my earlier statement may have been misleading, so let me explain:

I am the only true user in the system, but there are identities listed as part of the exercise in order to facilitate the learning experience; these other "people" do not actually appear as users, as far as I can tell.

RE: Build an Application: Step-by-Step #8 Exercise to Accompany Interfaces 101

Vyshnavi Naripeddi — Thu, 10 Apr 2025 02:13:57 GMT

Hi ,

Can you check the values for the "Created By" column? Does it have only your username on it?

RE: Build an Application: Step-by-Step #8 Exercise to Accompany Interfaces 101

jacobb122 — Wed, 09 Apr 2025 14:56:28 GMT

Good day Vyshnavi,

I had a nearly identical issue on the same part of the Step-by-Step 8 Exercise:

My errors were on lines 355 and 483

I checked the pre-generated W#SA Maintenance Record Type to see if it flagged a similar error, and it does on line 112

So I am wondering if the issue is actually in the record type? I can't imagine why the expression would fail for an invalid/nonexistent user, since I am the only user in this system

RE: Build an Application: Step-by-Step #8 Exercise to Accompany Interfaces 101

monicaf0002 — Fri, 04 Apr 2025 11:55:07 GMT

Hi segue arquivo em anexo.community.appian.com/.../W_5F00_W1731SAVehicleSummary.txt

RE: Build an Application: Step-by-Step #8 Exercise to Accompany Interfaces 101

monicaf0002 — Tue, 01 Apr 2025 20:48:04 GMT

;-)

RE: Build an Application: Step-by-Step #8 Exercise to Accompany Interfaces 101

monicaf0002 — Tue, 01 Apr 2025 20:47:24 GMT

Hello Vyshnavi!! :-)

I will attach the .txt file with the code to the message.

Thank you very much!!a!headerContentLayout(
  contents: {
    a!columnsLayout(
      columns: {
        a!columnLayout(
          showWhen: a!isPageWidth({ "DESKTOP", "DESKTOP_WIDE" }),
          contents: {}
        ),
        a!columnLayout(
          width: "WIDE",
          contents: {
            a!sectionLayout(
              label: "Details",
              labelSize: "MEDIUM",
              labelColor: "STANDARD",
              contents: {
                a!cardLayout(
                  contents: {
                    a!columnsLayout(
                      columns: {
                        a!columnLayout(
                          contents: {
                            a!richTextDisplayField(
                              label: "Make",
                              value: {
                                a!defaultValue(
                                  ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.fields.{941d0ced-2fb5-4fde-a295-286083fabb07}make'],
                                  "–"
                                )
                              }
                            )
                          }
                        ),
                        a!columnLayout(
                          contents: {
                            a!richTextDisplayField(
                              label: "Model",
                              value: {
                                a!defaultValue(
                                  ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.fields.{d4352b9c-6c57-4a17-a9a8-145b25def765}model'],
                                  "–"
                                )
                              }
                            )
                          }
                        ),
                        a!columnLayout(
                          contents: {
                            a!richTextDisplayField(
                              label: "Color",
                              value: {
                                a!defaultValue(
                                  ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.fields.{d636ee9a-44c5-4ceb-a323-0223162dea9e}color'],
                                  "–"
                                )
                              }
                            )
                          }
                        )
                      }
                    ),
                    a!columnsLayout(
                      columns: {
                        a!columnLayout(
                          contents: {
                            a!richTextDisplayField(
                              label: "Vehicle Condition",
                              value: {
                                a!defaultValue(
                                  ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.relationships.{76aef921-fd02-461e-b93a-75b693b1be6d}vehicleCondition.fields.{374df96f-5bb5-4f8b-aafe-d86f8b3b00ee-w1731aa}value'],
                                  "–"
                                )
                              }
                            )
                          }
                        ),
                        a!columnLayout(
                          contents: {
                            a!richTextDisplayField(
                              label: "Vehicle Status",
                              value: {
                                a!defaultValue(
                                  ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.relationships.{718e1bd6-273d-4681-89cf-3682b0462a62}vehicleStatus.fields.{ba580c3e-2697-4c62-919b-db8a9d440572-w1731aa}value'],
                                  "–"
                                )
                              }
                            )
                          }
                        ),
                        a!columnLayout(
                          contents: {
                            a!richTextDisplayField(
                              label: "Vehicle Category",
                              value: {
                                a!defaultValue(
                                  ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.relationships.{2e76c752-e388-4f22-9ea8-44a9dbfbd277}vehicleCategory.fields.{8587ac12-bc92-4a00-bad1-20d227b29766-w1731aa}value'],
                                  "–"
                                )
                              }
                            )
                          }
                        )
                      },
                      marginAbove: "STANDARD"
                    ),
                    a!columnsLayout(
                      columns: {
                        a!columnLayout(
                          contents: {
                            a!richTextDisplayField(
                              label: "Mileage",
                              value: {
                                a!defaultValue(
                                  ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.fields.{605a20b4-2463-4c25-b317-ae3ed3bb62c3}mileage'],
                                  "–"
                                )
                              }
                            )
                          }
                        ),
                        a!columnLayout(
                          contents: {
                            a!richTextDisplayField(
                              label: "Year",
                              value: {
                                a!defaultValue(
                                  ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.fields.{7652f864-4e92-433e-88fd-c4faa2bbff1b}year'],
                                  "–"
                                )
                              }
                            )
                          }
                        ),
                        a!columnLayout(
                          contents: {
                            a!richTextDisplayField(
                              label: "Last Maintenance Date",
                              value: {
                                if(
                                  isnull(
                                    ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.fields.{28422212-b673-4a73-a4af-315b877b9f56}lastMaintenanceDate']
                                  ),
                                  "–",
                                  {
                                    a!richTextIcon(
                                      icon: "calendar",
                                      color: "SECONDARY"
                                    ),
                                    " ",
                                    a!richTextItem(
                                      text: text(
                                        ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.fields.{28422212-b673-4a73-a4af-315b877b9f56}lastMaintenanceDate'],
                                        "mmmm d, yyyy"
                                      )
                                    )
                                  }
                                )
                              }
                            )
                          }
                        )
                      },
                      marginAbove: "STANDARD"
                    ),
                    a!columnsLayout(
                      columns: {
                        a!columnLayout(
                          contents: {
                            a!richTextDisplayField(
                              label: "Next Maintenance Date",
                              value: {
                                if(
                                  isnull(
                                    ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.fields.{28756142-ff1c-49c9-a253-1787f20638ae}nextMaintenanceDate']
                                  ),
                                  "–",
                                  {
                                    a!richTextIcon(
                                      icon: "calendar",
                                      color: "SECONDARY"
                                    ),
                                    " ",
                                    a!richTextItem(
                                      text: text(
                                        ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.fields.{28756142-ff1c-49c9-a253-1787f20638ae}nextMaintenanceDate'],
                                        "mmmm d, yyyy"
                                      )
                                    )
                                  }
                                )
                              }
                            )
                          }
                        ),
                        a!columnLayout(
                          contents: {
                            a!richTextDisplayField(
                              label: "Image",
                              value: {
                                a!defaultValue(
                                  ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.fields.{963defca-af23-463a-8cd9-6a5ac94c02a2}image'],
                                  "–"
                                )
                              }
                            )
                          }
                        ),
                        a!columnLayout(
                          contents: {
                            a!richTextDisplayField(
                              label: "Added On",
                              value: {
                                if(
                                  isnull(
                                    ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.fields.{54aa1d12-78bd-429c-8d1d-83fa7f33e200}addedOn']
                                  ),
                                  "–",
                                  {
                                    a!richTextIcon(
                                      icon: "calendar",
                                      color: "SECONDARY"
                                    ),
                                    " ",
                                    a!richTextItem(
                                      text: text(
                                        ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.fields.{54aa1d12-78bd-429c-8d1d-83fa7f33e200}addedOn'],
                                        "mmmm d, yyyy"
                                      )
                                    )
                                  }
                                )
                              }
                            )
                          }
                        )
                      },
                      marginAbove: "STANDARD"
                    ),
                    a!columnsLayout(
                      columns: {
                        a!columnLayout(
                          contents: {
                            a!richTextDisplayField(
                              label: "Modified On",
                              value: {
                                if(
                                  isnull(
                                    ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.fields.{83a95085-cd4f-4242-9318-ac06d1721c30}modifiedOn']
                                  ),
                                  "–",
                                  {
                                    a!richTextIcon(
                                      icon: "calendar",
                                      color: "SECONDARY"
                                    ),
                                    " ",
                                    a!richTextItem(
                                      text: text(
                                        ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.fields.{83a95085-cd4f-4242-9318-ac06d1721c30}modifiedOn'],
                                        "mmmm d, yyyy"
                                      )
                                    )
                                  }
                                )
                              }
                            )
                          }
                        ),
                        a!columnLayout(
                          contents: {
                            a!richTextDisplayField(
                              label: "Mileage Category",
                              value: {
                                a!defaultValue(
                                  ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.fields.{13a3b03a-34ef-4097-8243-6a733e72b41f}mileageCategory'],
                                  "–"
                                )
                              }
                            )
                          }
                        ),
                        a!columnLayout(
                          contents: {
                            a!richTextDisplayField(
                              label: "Cost Sum",
                              value: {
                                a!defaultValue(
                                  ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.fields.{a43d0038-1140-4a28-a279-79b697a67630}costSum'],
                                  "–"
                                )
                              }
                            )
                          }
                        )
                      },
                      marginAbove: "STANDARD"
                    ),
                    a!columnsLayout(
                      columns: {
                        a!columnLayout(
                          contents: {
                            a!richTextDisplayField(
                              label: "Count Of Maintenance Requests",
                              value: {
                                a!defaultValue(
                                  ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.fields.{9bbbc182-54c3-4263-b58a-1c6a5af0c11f}countOfMaintenanceRequests'],
                                  "–"
                                )
                              }
                            )
                          }
                        ),
                        a!columnLayout(
                          contents: {}
                        ),
                        a!columnLayout(
                          contents: {}
                        )
                      },
                      marginAbove: "STANDARD"
                    )
                  },
                  shape: "SEMI_ROUNDED",
                  padding: "STANDARD"
                )
              },
              marginBelow: "MORE"
            ),
            a!sectionLayout(
              label: "W1731sa Maintenance",
              labelSize: "MEDIUM",
              labelColor: "STANDARD",
              contents: {
                a!cardLayout(
                  contents: {
                    a!gridField(
                      label: "W1731sa Maintenance",
                      labelPosition: "COLLAPSED",
                      data: a!recordData(
                        recordType: 'recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance',
                        filters: a!queryLogicalExpression(
                          operator: "AND",
                          filters: {
                            a!queryFilter(
                              field: 'recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance.fields.{0a9a64a2-3a36-4054-b5de-b506150265f6}vehicleId',
                              operator: "=",
                              value: ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.fields.{47c10c8b-83f1-49d0-9c36-ab4d9c912573}id']
                            )
                          },
                          ignoreFiltersWithEmptyValues: true
                        )
                      ),
                      columns: {
                        a!gridColumn(
                          label: "Id",
                          sortField: 'recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance.fields.{62a14481-de90-4aa7-88fd-b42d781de2a3}id',
                          value: a!richTextDisplayField(
                            value: {
                              a!richTextItem(
                                text: if(
                                  fv!row['recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance.fields.{62a14481-de90-4aa7-88fd-b42d781de2a3}id'] < 100000,
                                  text(
                                    fv!row['recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance.fields.{62a14481-de90-4aa7-88fd-b42d781de2a3}id'],
                                    "#00000"
                                  ),
                                  fv!row['recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance.fields.{62a14481-de90-4aa7-88fd-b42d781de2a3}id']
                                ),
                                link: a!recordLink(
                                  recordType: 'recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance',
                                  identifier: fv!identifier
                                ),
                                linkStyle: "STANDALONE"
                              )
                            }
                          )
                        ),
                        a!gridColumn(
                          label: "Vehicle Id",
                          sortField: 'recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance.fields.{0a9a64a2-3a36-4054-b5de-b506150265f6}vehicleId',
                          value: a!defaultValue(fv!row['recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance.fields.{0a9a64a2-3a36-4054-b5de-b506150265f6}vehicleId'], "–"),
                          align: "END"
                        ),
                        a!gridColumn(
                          label: "Issue",
                          sortField: 'recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance.fields.{f3b22a51-4b64-48bf-aa57-3134702b055c}issue',
                          value: a!defaultValue(fv!row['recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance.fields.{f3b22a51-4b64-48bf-aa57-3134702b055c}issue'], "–")
                        ),
                        a!gridColumn(
                          label: "Is Scheduled",
                          sortField: 'recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance.fields.{9c49aa56-97aa-4e11-96ac-80ef17385ee2}isScheduled',
                          value: if(
                            isnull(fv!row['recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance.fields.{9c49aa56-97aa-4e11-96ac-80ef17385ee2}isScheduled']),
                            "–",
                            a!richTextDisplayField(
                              value: if(
                                fv!row['recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance.fields.{9c49aa56-97aa-4e11-96ac-80ef17385ee2}isScheduled'],
                                a!richTextIcon(
                                  icon: "check",
                                  altText: "Yes",
                                  color: "#138901"
                                ),
                                a!richTextIcon(
                                  icon: "times",
                                  altText: "No",
                                  color: "SECONDARY"
                                )
                              )
                            )
                          ),
                          align: "CENTER"
                        ),
                        a!gridColumn(
                          label: "Status",
                          sortField: 'recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance.fields.{d1c52fb0-da04-4b7c-8fe3-f59cd65524d9}status',
                          value: a!defaultValue(fv!row['recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance.fields.{d1c52fb0-da04-4b7c-8fe3-f59cd65524d9}status'], "–")
                        ),
                        a!gridColumn(
                          label: "Start Date",
                          sortField: 'recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance.fields.{6b6bcef1-b65c-482a-997e-071af005b00b}startDate',
                          value: a!defaultValue(fv!row['recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance.fields.{6b6bcef1-b65c-482a-997e-071af005b00b}startDate'], "–"),
                          align: "END"
                        ),
                        a!gridColumn(
                          label: "End Date",
                          sortField: 'recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance.fields.{cf0609f3-864d-4c77-89e4-2390f35a8935}endDate',
                          value: a!defaultValue(fv!row['recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance.fields.{cf0609f3-864d-4c77-89e4-2390f35a8935}endDate'], "–"),
                          align: "END"
                        ),
                        a!gridColumn(
                          label: "Cost",
                          sortField: 'recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance.fields.{40d53887-e373-4186-b112-1a815e99057f}cost',
                          value: a!defaultValue(fv!row['recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance.fields.{40d53887-e373-4186-b112-1a815e99057f}cost'], "–"),
                          align: "END"
                        ),
                        a!gridColumn(
                          label: "Assigned Mechanic",
                          sortField: 'recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance.fields.{1fd4d92c-1f95-4d1f-8a09-884f2a2f333e}assignedMechanic',
                          value: a!defaultValue(fv!row['recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance.fields.{1fd4d92c-1f95-4d1f-8a09-884f2a2f333e}assignedMechanic'], "–")
                        ),
                        a!gridColumn(
                          label: "Created By",
                          sortField: 'recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance.fields.{8f9bee44-7d9b-4947-b421-81e073962194}createdBy',
                          value: a!defaultValue(fv!row['recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance.fields.{8f9bee44-7d9b-4947-b421-81e073962194}createdBy'], "–")
                        ),
                        a!gridColumn(
                          label: "Created On",
                          sortField: 'recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance.fields.{d534c9d1-2285-45fc-8f0d-82468e635195}createdOn',
                          value: a!defaultValue(fv!row['recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance.fields.{d534c9d1-2285-45fc-8f0d-82468e635195}createdOn'], "–"),
                          align: "END"
                        ),
                        a!gridColumn(
                          label: "Modified",
                          sortField: 'recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance.fields.{0273b8c2-f4bd-404f-badf-1fc34bf13300}modifiedOn',
                          value: a!richTextDisplayField(
                            value: a!localVariables(
                              local!isUserValueBlank: isnull(fv!row['recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance.fields.{f07dd2a8-11a8-4619-8b67-05011e1a3ede}modifiedBy']),
                              local!isTimeValueBlank: isnull(fv!row['recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance.fields.{0273b8c2-f4bd-404f-badf-1fc34bf13300}modifiedOn']),
                              if(
                                and(
                                  local!isUserValueBlank,
                                  local!isTimeValueBlank
                                ),
                                "–",
                                {
                                  if(
                                    local!isTimeValueBlank,
                                    "–",
                                    datetext(fv!row['recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance.fields.{0273b8c2-f4bd-404f-badf-1fc34bf13300}modifiedOn'], "default")
                                  ),
                                  char(10),
                                  a!richTextItem(
                                    text: if(
                                      local!isUserValueBlank,
                                      "–",
                                      user(fv!row['recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance.fields.{f07dd2a8-11a8-4619-8b67-05011e1a3ede}modifiedBy'], "firstName") & " " & user(fv!row['recordType!{0af82f56-04cc-4f39-afab-6dd334c09858}W1731SA Maintenance.fields.{f07dd2a8-11a8-4619-8b67-05011e1a3ede}modifiedBy'], "lastName")
                                    ),
                                    color: "SECONDARY"
                                  )
                                }
                              )
                            )
                          ),
                          align: "START",
                          width: "NARROW_PLUS"
                        )
                      },
                      pageSize: 5,
                      rowHeader: 1,
                      showSearchBox: true,
                      showRefreshButton: true,
                      borderStyle: "LIGHT",
                      shadeAlternateRows: false,
                      refreshAfter: "RECORD_ACTION"
                    )
                  },
                  shape: "SEMI_ROUNDED",
                  padding: "STANDARD"
                )
              },
              marginBelow: "MORE"
            )
          }
        ),
        a!columnLayout(
          width: "MEDIUM",
          contents: {
            a!sectionLayout(
              label: "Contacts",
              labelSize: "MEDIUM",
              labelColor: "STANDARD",
              contents: {
                a!cardLayout(
                  contents: {
                    a!sideBySideLayout(
                      items: {
                        a!sideBySideItem(
                          width: "MINIMIZE",
                          item: a!imageField(
                            labelPosition: "COLLAPSED",
                            size: "EXTRA_SMALL",
                            style: "AVATAR",
                            images: a!userImage(
                              user: ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.fields.{17d2f292-fe43-4f50-bb89-9944bf24daf3}addedBy']
                            )
                          )
                        ),
                        a!sideBySideItem(
                          item: a!richTextDisplayField(
                            labelPosition: "COLLAPSED",
                            value: {
                              if(
                                a!isNullOrEmpty(ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.fields.{17d2f292-fe43-4f50-bb89-9944bf24daf3}addedBy']),
                                a!richTextItem(
                                  text: {
                                    "-"
                                  }
                                ),
                                a!richTextItem(
                                  text: {
                                    user(
                                      ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.fields.{17d2f292-fe43-4f50-bb89-9944bf24daf3}addedBy'],
                                      "firstName"
                                    ) & " " & user(
                                      ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.fields.{17d2f292-fe43-4f50-bb89-9944bf24daf3}addedBy'],
                                      "lastName"
                                    )
                                  },
                                  color: "ACCENT",
                                  style: {
                                    "STRONG"
                                  }
                                )
                              ),
                              char(10),
                              a!richTextItem(
                                text: {
                                  "Added By"
                                },
                                color: "SECONDARY"
                              )
                            }
                          )
                        )
                      },
                      alignVertical: "MIDDLE"
                    )
                  },
                  shape: "SEMI_ROUNDED",
                  padding: "LESS",
                  marginBelow: "STANDARD",
                  link: if(
                    a!isNullOrEmpty(ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.fields.{17d2f292-fe43-4f50-bb89-9944bf24daf3}addedBy']),
                    null,
                    a!userRecordLink(
                      user: ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.fields.{17d2f292-fe43-4f50-bb89-9944bf24daf3}addedBy']
                    )
                  )
                ),
                a!cardLayout(
                  contents: {
                    a!sideBySideLayout(
                      items: {
                        a!sideBySideItem(
                          width: "MINIMIZE",
                          item: a!imageField(
                            labelPosition: "COLLAPSED",
                            size: "EXTRA_SMALL",
                            style: "AVATAR",
                            images: a!userImage(
                              user: ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.fields.{069662ad-d53c-41ea-87d0-eeb15ab6b455}modifiedBy']
                            )
                          )
                        ),
                        a!sideBySideItem(
                          item: a!richTextDisplayField(
                            labelPosition: "COLLAPSED",
                            value: {
                              if(
                                a!isNullOrEmpty(ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.fields.{069662ad-d53c-41ea-87d0-eeb15ab6b455}modifiedBy']),
                                a!richTextItem(
                                  text: {
                                    "-"
                                  }
                                ),
                                a!richTextItem(
                                  text: {
                                    user(
                                      ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.fields.{069662ad-d53c-41ea-87d0-eeb15ab6b455}modifiedBy'],
                                      "firstName"
                                    ) & " " & user(
                                      ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.fields.{069662ad-d53c-41ea-87d0-eeb15ab6b455}modifiedBy'],
                                      "lastName"
                                    )
                                  },
                                  color: "ACCENT",
                                  style: {
                                    "STRONG"
                                  }
                                )
                              ),
                              char(10),
                              a!richTextItem(
                                text: {
                                  "Modified By"
                                },
                                color: "SECONDARY"
                              )
                            }
                          )
                        )
                      },
                      alignVertical: "MIDDLE"
                    )
                  },
                  shape: "SEMI_ROUNDED",
                  padding: "LESS",
                  marginBelow: "STANDARD",
                  link: if(
                    a!isNullOrEmpty(ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.fields.{069662ad-d53c-41ea-87d0-eeb15ab6b455}modifiedBy']),
                    null,
                    a!userRecordLink(
                      user: ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.fields.{069662ad-d53c-41ea-87d0-eeb15ab6b455}modifiedBy']
                    )
                  )
                )
              },
              marginBelow: "MORE"
            ),
            a!sectionLayout(
              label: "Event History",
              labelSize: "MEDIUM",
              labelColor: "STANDARD",
              contents: {
                a!cardLayout(
                  contents: {
                    a!eventHistoryListField(
                      eventStyle: "LIST_WITH_COMMENTS",
                      labelPosition: "COLLAPSED",
                      refreshAfter: "RECORD_ACTION",
                      commentLayout: "LIST",
                      commentCardColor: "TRANSPARENT",
                      pageSize: 3,
                      displayUser: "IMAGE",
                      showSearchBox: false,
                      showReverseSortButton: false,
                      eventData: a!eventData(
                        recordType: 'recordType!{456287ee-e90f-431a-80f0-a0437dfb0db7}W W1731SA Vehicle Event History',
                        user: 'recordType!{456287ee-e90f-431a-80f0-a0437dfb0db7}W W1731SA Vehicle Event History.fields.{b5046fbd-a861-4317-8ba3-6e9512cdb491}user',
                        timestamp: 'recordType!{456287ee-e90f-431a-80f0-a0437dfb0db7}W W1731SA Vehicle Event History.fields.{c86c70ee-4047-4e2e-90dd-8237dce71e89}timestamp',
                        comment: 'recordType!{456287ee-e90f-431a-80f0-a0437dfb0db7}W W1731SA Vehicle Event History.fields.{17b5adf5-217c-4857-823a-569be37dc5bd}comment',
                        allowUsersToComment: true,
                        allowUsersToReply: false,
                        baseRecordIdForComment: ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.fields.{47c10c8b-83f1-49d0-9c36-ab4d9c912573}id'],
                        eventTypeName: fv!data['recordType!{456287ee-e90f-431a-80f0-a0437dfb0db7}W W1731SA Vehicle Event History.relationships.{445ca83a-a801-4f9d-8da3-2e092b36b06a}eventType.fields.{be45591f-4ad6-448f-8a1c-6fca1134da80}eventName'],
                        filters: a!queryFilter(
                          field: 'recordType!{456287ee-e90f-431a-80f0-a0437dfb0db7}W W1731SA Vehicle Event History.fields.{49d152bb-27da-459b-8faf-a5c67ad01f16}recordId',
                          operator: "=",
                          value: ri!record['recordType!{a4feb9b1-4e07-45c1-8802-e7fe88b94dc7}W1731SA Vehicle.fields.{47c10c8b-83f1-49d0-9c36-ab4d9c912573}id']
                        )
                      )
                    )
                  },
                  shape: "SEMI_ROUNDED",
                  padding: "LESS"
                )
              },
              marginBelow: "MORE"
            )
          }
        ),
        a!columnLayout(
          showWhen: a!isPageWidth({ "DESKTOP", "DESKTOP_WIDE" }),
          contents: {}
        )
      },
      marginAbove: "MORE",
      spacing: "SPARSE",
      stackWhen: {
        "TABLET_PORTRAIT",
        "PHONE"
      }
    )
  },
  backgroundColor: "#fbfbfb"
)

RE: Build an Application: Step-by-Step #8 Exercise to Accompany Interfaces 101

Vyshnavi Naripeddi — Fri, 28 Mar 2025 02:45:38 GMT

Based on the [InvalidUserException] error, it seems that the provided username is NOT NULL, but the specified user does not exist in Appian. If the username is NULL, the error would have been "Expression evaluation error at function 'user': Null argument not allowed"

To prevent this issue, you can use the a!usernametaken() function to verify if the username exists before calling the user() function.

Could you share the code snippet of the a!gridColumn() configuration where you're facing the issue?