Nested Paging entity Framework

[s-leonard]

Is there an existing issue for this?

• [X] I have searched the existing issues

Describe the bug

I'm using the entity framework integration and I have tried doing paging on a child collection with annotations

 public class Person 
  {
      [GraphQLDescription("Name of the member")]
      public string Name { get; set; }

      [GraphQLDescription("Things they like")]
      [UsePaging]
      public ICollection<Interest> Interests { get; set; } = new List<Interest>();
  }

which didn't work and I found another issue https://github.com/ChilliCream/hotchocolate/issues/4214 which suggests you cannot get nested paging to work with annotations.

So, I've tried to make a PersonType and define a resolver but it just breaks the schema and the just says encountered an error fetching the schema.

public class PersonType : ObjectType<Person>
{
    protected override void Configure(IObjectTypeDescriptor<Person> descriptor)
    {
        descriptor
               .Field(p => p.Name)
               .Description("Name of the member");

        descriptor
            .Field(p => p.Interests)
            .UsePaging()
            .ResolveWith<Resolvers>(p => p.GetInterests(default!, default!))
            .UseDbContext<AppDbContext>()
            .Description("Things they like");

    }

    private class Resolvers
    {
        public IQueryable<Interest> GetInterests([Parent] Person person, [ScopedService] AppDbContext context)
        {
            return context.Interests.Where(x => x.PersonId == person.Id);
        }
    }
}

If I remove the .UsePaging() the collection works but when I add it back the schema breaks and I cant find any docs on how to do paging for a collection within another object?

Steps to reproduce

Use entity framework integration, add child collection to a type apply add paging.

Relevant log output

No response

Additional Context?

No response

Product

Hot Chocolate

Version

12.0.0

[PascalSenn]

What error do you get when you define the type?

[s-leonard]

The UI says encountered an error fetching the schema but I'm not sure what the error is or how to see it

[s-leonard]

@PascalSenn I found how to get the schema error which I fixed by .UseDbContext<AppDbContext>() above .UsePaging()

and now it goes back to the same error I got when I was using the annotations which is

Type 'System.Collections.Generic.ICollection`1[App.Interest]' does not have a default constructor (Parameter 'type')

[zyofeng]

Have you ever got to the bottom of this issue?

@PascalSenn I found how to get the schema error which I fixed by .UseDbContext<AppDbContext>() above .UsePaging()

and now it goes back to the same error I got when I was using the annotations which is

Type 'System.Collections.Generic.ICollection`1[App.Interest]' does not have a default constructor (Parameter 'type')

[PascalSenn]

@zyofeng nested pagination is currently not projectiable i guess this is the issue

[zyofeng]

@zyofeng nested pagination is currently not projectiable i guess this is the issue

Not just pagination, UseFirstOrDefault also does not work. I tried opting out of Projection by using IsProjected attribute on the property but that does not seem to have made any difference.

[marek-nereca]

This issue is blocking for our project, any updates on this?

[candidodmv]

Hello @PascalSenn If I'm not missunderstood, currently is not possible to paginate nested objects with EF data provider?

[BjornFrierPedersen]

No news on this? @PascalSenn

[capitlux]

Hi, @PascalSenn: Any News ? Thx !

[PascalSenn]

@capitlux @BjornFrierPedersen

While it's not "automatic" projection, the following new concepts are avaialbe in v14: https://www.youtube.com/watch?v=kOGS7HI3lEA