How can we use association in custom CDS entity in RAP?

[Rohitautodesk]

I have a use case where I want to use association in the custom entity in RAP. The Association/Composition  is not with the child but it is pointing to the independent entity. Is there a way we can achieve this?

Basically I want to expose value help in custom entity (From some other entity) which the framework is not allowing me.

[junwu]

valuehelp doesn't need association. you just specify the cds as the valuehelp.

[clsorensen911]

Hello @Rohitautodesk ,

Maybe I misunderstand the question, but here is a quick example of how I implemented a value help in a (I admit, very simple) RAP app. 

Step 1: Value Help CDS View and annotation

I created a simple value help CDS View for "Country" and then added that value help as a annotation in the CDS view that is used by the RAP application:

Value Help View

@AbapCatalog.viewEnhancementCategory: [#NONE]
@AccessControl.authorizationCheck: #NOT_REQUIRED
@EndUserText.label: 'Country'
@Metadata.ignorePropagatedAnnotations: true
@ObjectModel.usageType:{
    serviceQuality: #X,
    sizeCategory: #S,
    dataClass: #MIXED
}
@ObjectModel.dataCategory: #VALUE_HELP
@ObjectModel.representativeKey: 'Country'
@Search.searchable: true

define view entity ZR_T005T 
    as select from t005t
{
    @EndUserText.label: 'Country Code'
    key land1 as Country,
    @Search.defaultSearchElement: true
    @Semantics.text: true
    @Search.ranking: #HIGH
    @Search.fuzzinessThreshold: 0.75
    @EndUserText.label: 'Country'
    landx50 as Description
}

where spras = 'E'

Annotation in main CDS view

  @Consumption.valueHelpDefinition: [{
        entity : { name: 'ZR_T005T' , element: 'Country'},
        label: 'Country' , useForValidation: true, distinctValues: true
    }]

Effect on App:

When creating a draft, the value help is now available. 

Hope this helps 🙂