Relay - Global Object Identification specification

[AleksandarFaraj]

Hello! Thanks for a great library!

I'm looking to create a front facing 99design/gqlgen server that interacts with my internal grpc service. I'm looking to create a graphql server to fulfill https://graphql.org/learn/global-object-identification/ (GOI)

I use this library to autobind my base types but I don't use the resolvers at all, I use gqlgen for that. I still would like to use both go, go-grpc, gogql and gpl.

The graphql schema I'm trying to replicate can be found here: https://relay.dev/docs/guides/graphql-server-specification/

There are some issues I run into that could be solved:

1. Graphql "type Ship implements Node"
   Issue: I would like to extend my proto types but it's not possible.
   Solution: a message option could be made like this:
   message Ship {
option (danielvladco.protobuf.graphql.message) = {implements: "Node"};
string id = 1;
}
   Expected:
   The gogql outputs: type Node interface { IsNode() } func (*Ship) IsNode() {}
   The gpl outputs following graphql: type Ship implements Node {}
   Considerations: if node was a type / message Node {} then it would be a struct generated by go/go-grpc that would collide with a possilbe interface Node {}. Another question is how and where the Node definition should be, perhaps there is a nested option structure that can be applied as a file option?.

2. gql generator, generates "dummy" query for "definition" proto files that contain only types (message Ship, etc.).
   Issue: If I only want types to be generated in the .graphql, it's not possible right now. It only output types that are traversed from a service then method and then field. There is a svc=false config that only applies to the directive.

3. change the type of id to ID.
   Issue: Creating a custom type creates a nested like structure in proto which is not ideal.
   Solution: a field option that changes the type of graphql.
   string id = 1 [(danielvladco.protobuf.graphql.field) = {required: true, type: "ID"}];
   Expected:
   The gpl outputs following graphql: type Ship { id: ID! }