Filter EF Core Navigation property on GraphQL HotChocolate

Question

I am using HotChocolate (11.2.2) with EF Core and want to filter a sub property. According to the GraphQL docu this should be possible by using the filter keyword on the navigation property but HotChocolate just fails.

My schema:

type A {
    Name: string,
    RefTo: [B]
}
type B {
    TypeName: string,
    Value: int
}

This is backed by EF and I provide an IQueryable<A> to HotChocolate.

[UsePaging]
[UseProjection]
[UseFiltering]
[UseSorting]
public IQueryable<A> GetAs([Service] Context db) => db.As.AsSingleQuery().AsNoTrackingWithIdentityResolution();

Now I want to include only those Bs where the TypeName is equal to "ExampleType" like this:

query {
   As {
      Name,
      RefTo(where: { TypeName: { eq: "ExampleType" } })
      {
          TypeName,
          Value
      }
   }
}

But HotChcolate does not seem to understand this and says:

Unknown argument "where" on field "A.RefTo".validation

Is it possible to filter Navigation Properties with an EF Core model?

Answer 1

You would have to add filtering to RefTo too

[UseFiltering] 
public ICollection<A> RefTo {get; set;}