Determining the different options of a pull-down menu from a database entity?

RE: Determining the different options of a pull-down menu from a database entity?

fgrl — Thu, 22 Apr 2021 11:55:18 GMT

Thanks for all the hints! I will use more local variables now.

RE: Determining the different options of a pull-down menu from a database entity?

Mike Schmitt — Wed, 21 Apr 2021 16:15:10 GMT

Additionally, the way you're trying to refer to "identifiers" won't work. "Identifiers" is not a sub-property of ".data", but instead a property of the query result (i.e. the data subset returned by a!queryEntity).

I suggest that instead of trying to mess with "identifiers", just include the primary key field in the list of columns you're including in your a!querySelection(); then you can refer directly to the primary key field by its field name instead of trying to use ".identifiers".

RE: Determining the different options of a pull-down menu from a database entity?

Mike Schmitt — Wed, 21 Apr 2021 16:12:00 GMT

Why are you running the same query twice, once for choiceLabels and once for choiceValues? That seems pretty inefficient.

Instead you should be doing something like this, querying just once into a local variable and then referring to that subsequently.

a!localVariables(
  local!taskNames: rule!APAS_GetAllGenericTaskNames().data,
  
  a!dropdownField(
    label: "Generic step type",
    labelPosition: "ABOVE",
    placeholder: "--- Please choose a step type ---",
    choiceLabels: local!taskNames.genericTaskName,
    choiceValues: local!taskNames.identifiers,
    saveInto: {},
    searchDisplay: "AUTO",
    validations: {}
  )
)

As an aside: you've posted code a few different ways above, but I universally recommend using the "Code Box" i've used here. For reference:

RE: Determining the different options of a pull-down menu from a database entity?

Arun Dubey — Wed, 21 Apr 2021 12:11:26 GMT

choiceValues: {rule!APAS_GetAllGenericTaskNames.data.identifiers}
Why are you using identifiers ?
I don't know your use case but if you are trying to store or display then use same for both 
choiceLabels and choiceValues.

choiceLabels: {rule!APAS_GetAllGenericTaskNames().data.genericTaskName},
      choiceValues: {rule!APAS_GetAllGenericTaskNames().data.genericTaskName},

RE: Determining the different options of a pull-down menu from a database entity?

fgrl — Wed, 21 Apr 2021 12:03:25 GMT

I still receive an error:

Could not display interface. Please check definition and inputs. Interface Definition: Expression evaluation error at function a!dropdownField [line 19]: A dropdown component [label=“Generic step type”] has an invalid value for “choiceValues”. Choice values cannot be null.

This is curious, because I explicitly neither allowed null-values in the column genericTaskName of underlying database table, nor are there any null-values in the table.

The types seem to fit, at least when testing the expression rule.

RE: Determining the different options of a pull-down menu from a database entity?

Arun Dubey — Wed, 21 Apr 2021 11:54:07 GMT

Hi,

I think you are missing () while calling the rules.

choiceLabels: {rule!APAS_GetAllGenericTaskNames().data.genericTaskName},
      choiceValues: {rule!APAS_GetAllGenericTaskNames().data.identifiers},