Running the Fiori preview on an entity which is being served from an external OData v2 service the page shows the error 'Feature not supported: Method .count of fluent API'. Is there a way this can be resolved in the service implementation?
This would support $filter in the query (and therefore is not the solution I'm after), but for testing purposes I tried checking for req.query.cqn.count being true and then executing an explicit OData v2 $count request:
return await ext.tx(req).get("/User/$count")
This does get the count, but returning a number in the service implementation then results in the following error:
[2020-07-06T19:41:42.970Z | ERROR | 1773773]: An error occurred during serialization of the entity collection.