Support fields that return top level operations

[marwan-at-work]

What happened?

It's technically possible to have the following schema definition:

type Query {
  withUser(id: String): Query!
  user: User!
}

type User {
  id: String!
  name: String!
}

Note that withUser returns a Query object

What did you expect?

For gqlgen to handle this use case, though I imagine it's not straight forward since gqlgen doesn't create a Go Query type.

Minimal graphql.schema and models to reproduce

• gqlgen init
• replace the schema with the one above
• gqlgen

Output;

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x18 pc=0x149f87c]

goroutine 1 [running]:
github.com/99designs/gqlgen/codegen/config.(*TypeReference).IsPtr(...)
	/Users/marwansulaiman/marwan/gqlgen/codegen/config/binder.go:255
github.com/99designs/gqlgen/codegen.(*builder).buildField(0xc0001e9850, 0xc007f48600, 0xc000123340, 0x0, 0x1aa0aa0, 0xc003052b40)
	/Users/marwansulaiman/marwan/gqlgen/codegen/field.go:70 +0x35c
github.com/99designs/gqlgen/codegen.(*builder).buildObject(0xc0001e9850, 0xc00010f800, 0x15fb22e, 0x6, 0x0)
	/Users/marwansulaiman/marwan/gqlgen/codegen/object.go:73 +0x4e7
github.com/99designs/gqlgen/codegen.BuildData(0xc0001c6000, 0x16d9ba0, 0x1a9fc48, 0x0)
	/Users/marwansulaiman/marwan/gqlgen/codegen/data.go:89 +0x489
github.com/99designs/gqlgen/api.Generate(0xc0001c6000, 0x0, 0x0, 0x0, 0x0, 0xc0000d4050)
	/Users/marwansulaiman/marwan/gqlgen/api/generate.go:42 +0x233
github.com/99designs/gqlgen/cmd.glob..func1(0xc0001c4000)
	/Users/marwansulaiman/marwan/gqlgen/cmd/gen.go:39 +0xa1
github.com/urfave/cli.HandleAction(0x1532e20, 0x163dae8, 0xc0001c4000, 0xc00007a120, 0x0)
	/Users/marwansulaiman/go/pkg/mod/github.com/urfave/cli@v1.20.0/app.go:492 +0x7c
github.com/urfave/cli.(*App).Run(0xc0000a04e0, 0xc0000b8010, 0x1, 0x1, 0x0, 0x0)
	/Users/marwansulaiman/go/pkg/mod/github.com/urfave/cli@v1.20.0/app.go:264 +0x58c
github.com/99designs/gqlgen/cmd.Execute()
	/Users/marwansulaiman/marwan/gqlgen/cmd/root.go:41 +0x224
main.main()
	/Users/marwansulaiman/marwan/gqlgen/main.go:8 +0x20

[stale[bot]]

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