Expose and API from Appian

In Appian, when you create a new web api object, this is one of the available templates. Takes about 5 clicks. Did you try this?

Hi Stefan/Acacio,

  I have implemented the Mapping to CDT with API Body, but getting the below error, can you please help me out with the same,

  Not a valid Web API Response. Received: [Lcom.appiancorp.core.expr.reaction.ReactionTree;@2617a999.

Internal Server Error on REST API invocation.
com.appiancorp.exceptions.LocalizedAppianRuntimeException$LocalizedAppianException: Contact your application administrator for help resolving this issue. Provide them with the following issue identifier: IV82KT3W (APNX-1-4533-000)

a!localVariables(
  local!jsondata : a!fromJson(
    http!request.body
  ),
  local!cdtdata : a!forEach(items: local!jsondata, expression:{'type!{urn:com:appian:types}PF_Request'(
    requestId: fv!item[fv!index].requestId, 
    destinationCountryID: fv!item[fv!index].destinationCountryID,
    frieghtCurrencyID: fv!item[fv!index].frieghtCurrencyID,
    GBEID: fv!item[fv!index].GBEID,
    LID: fv!item[fv!index].LID,
    LOBID: fv!item[fv!index].LOBID,
    leadSupplyLocationID: fv!item[fv!index].leadSupplyLocationID,
    originCountryID: fv!item[fv!index].originCountryID,
    processID: fv!item[fv!index].processID,
    reasonCodeID: fv!item[fv!index].reasonCodeID,
    regionID: fv!item[fv!index].regionID, 
    rootCauseID: fv!item[fv!index].rootCauseID,
    routingMethodID: fv!item[fv!index].routingMethodID,
    shipmentDirectionID: fv!item[fv!index].shipmentDirectionID,
    shipmentWidth: fv!item[fv!index].shipmentWidth,
    shipperID: fv!item[fv!index].shipperID,
    approvalLevels: fv!item[fv!index].approvalLevels,
    approvalLevelsCompleted: fv!item[fv!index].approvalLevelsCompleted,
    correctiveActionReason: fv!item[fv!index].correctiveActionReason,
    destionationCustomerSupplier: fv!item[fv!index].destionationCustomerSupplier,
    destinationSiteID: fv!item[fv!index].destinationSiteID, 
    fGPartNumber: fv!item[fv!index].fGPartNumber,
    freightCost: fv!item[fv!index].freightCost,
    isFreightRecoverable: fv!item[fv!index].isFreightRecoverable,
    isWeightKnown: fv!item[fv!index].isWeightKnown,
    originCustomerSupplier: fv!item[fv!index].originCustomerSupplier,
    originSiteID: fv!item[fv!index].originSiteID,
    originStateId: fv!item[fv!index].originStateId,
    otherRoutingMethod: fv!item[fv!index].otherRoutingMethod,
    otherShipper: fv!item[fv!index].otherShipper,  
    partNumber: fv!item[fv!index].partNumber, 
    projectNumber: fv!item[fv!index].projectNumber,
    purchaseOrder: fv!item[fv!index].purchaseOrder,
    requestDt: fv!item[fv!index].requestDt,
    requestor: fv!item[fv!index].requestor,
    requiredShipDate: fv!item[fv!index].requiredShipDate,
    revenueAtRisk: fv!item[fv!index].revenueAtRisk,
    rootCauseReason: fv!item[fv!index].rootCauseReason,
    ShipmentHeight: fv!item[fv!index].ShipmentHeight,
    ShipmentLength: fv!item[fv!index].ShipmentLength,
    ShipmentUnits: fv!item[fv!index].ShipmentUnits, 
    ShipmentWeight: fv!item[fv!index].ShipmentWeight,
    ShipperEmail: fv!item[fv!index].ShipperEmail,
    Status: fv!item[fv!index].Status,
    TotalCost: fv!item[fv!index].TotalCost,
    USFreightCost: fv!item[fv!index].USFreightCost,
    WaybillNumber: fv!item[fv!index].WaybillNumber,
    OriginSite: fv!item[fv!index].OriginSite,
    DestinationSite: fv!item[fv!index].DestinationSite,
    /*CompletedOn: fv!item[fv!index].CompletedOn,*/
    ActualFreightCost: fv!item[fv!index].ActualFreightCost,
    FreightRiskPercent: fv!item[fv!index].FreightRiskPercent,
    
  )
  
  }
  ),
  
  {
    
    a!startProcess(
      processModel: cons!Test_Email_WebAPI,
      processParameters: {
        PF_Request : local!cdtdata
      },
      onSuccess: a!httpResponse(
        statusCode: 200,
        headers: {
          a!httpHeader(name: "Content-Type", value: "application/json")
        },
        body: a!toJson(
          fv!processInfo
        )
      ),
      onError: a!httpResponse(
        statusCode: 500,
        headers: {
          a!httpHeader(name: "Content-Type", value: "application/json")
        },
        body: a!toJson(
          {
            error: "There was an error starting the process"
          }
        )
      )
    )
  }
  
)

There is a few things here. First, about the error message. Check this

https://docs.appian.com/suite/help/21.2/Appian_Administration_Console.html#simplified-error-messages

Then, the foreach(). fv!item already is a single item from the list. There is no need for [fv!index|.

Next, is the data structure in JSON any different than the CDT? Why recreate the data at all? Appian would happily map the data into your process.

Hi Helzle,

    There is no log with the ID V82KT3W (APNX-1-4533-000) in design_error.Csv

    also I changed the mapping as below, as you suggested, still facing the same error.

processParameters: {
        PF_Request : a!fromJson(
          http!request.body
        )
      },

Where do you get the error message? In Appian in the API designer?

Where do you get the error message? In Appian in the API designer?

in the WebAPI