Odtnhj

I used the VDM generator to create client classes for a custom OData service in S/4.
I'm trying to use the generated *Service class to get information from an Entity Set, using custom $filter and $expand parameters, but there doesn't seem to be a way to do so.
(The FluentHelperRead class doesn't have any method for defining custom parameters, like the ODataQueryBuilder has).

Right now this is what I'm using (it works):

/**
 * Query the I_MaintenancePlan entity set filtered by a list of Maint.Plan IDs
 * (The navigation property to_CallHistory will be preloaded via $expand)
 */
public List<MaintenancePlan> getMaintenancePlansById(final Iterable<String> maintPlanIds)
 throws ODataException 

 // Build lightweight $filter with the IDs
 String filterParts = StreamSupport.stream(maintPlanIds.spliterator(), false)
 .map(e -> String.format("MaintenancePlan eq '%s'", StringUtils.urlEncode(e)))
 .toArray(String::new);
 if (filterParts.length == 0)
 return new ArrayList<>(0);

 String filter = String.join(" or ", filterParts);

 ErpConfigContext erpConfig = new ErpConfigContext(DESTINATION_NAME);

 List<MaintenancePlan> result = ODataQueryBuilder.withEntity(ZCUSTOMODATASRVService.DEFAULT_SERVICE_PATH, "I_MaintenancePlan")
 .withoutMetadata()
 .expand("to_CallHistory")
 .param("$filter", filter)
 .withHeader("sap-client", erpConfig.getSapClient().getValue())
 .withHeader("sap-language", erpConfig.getLocale().getLanguage())
 .build()
 .execute(erpConfig)
 .asList(MaintenancePlan.class);

 return result; 

(ZCUSTOMODATASRVService and MaintenancePlan are generated VDM classes)

This is what I would like to use (using only the VDM classes):

ZCUSTOMODATASRVService service = new DefaultZCUSTOMODATASRVService();

List<MaintenancePlan> result = service.getAllMaintenancePlan()
 .param("$filter", filter)
 .param("$expand", "to_CallHistory")
 .execute(erpConfig);

Is there any way to do this?

Given your metadata, your VDM call could look like this:

List<MaintenancePlan> = 
 new DefaultZCUSTOMODATASRVService()
 .getAllMaintenancePlan()
 .filter(MaintenancePlan.CALL_HORIZON.eq("xyz"))
 .select(MaintenancePlan.TO_CALL_HISTORY)
 .execute(erpConfig);

You could expand further or reduce the projection via nested selects:

List<MaintenancePlan> result = 
 new DefaultZCUSTOMODATASRVService()
 .getAllMaintenancePlan()
 .filter(MaintenancePlan.CALL_HORIZON.eq("xyz"))
 .select(MaintenancePlan.TO_CALL_HISTORY
 .select(MaintenancePlanCallHistory.INDICATOR,
 MaintenancePlanCallHistory.MAINTENANCE_PLAN
 )
 )
 .execute(erpConfig);