GraphQL interface type and class extending support

[MichalLytek]

• support for GraphQLInterface
• support for extending classes with definitions

[MichalLytek]

Does this mean that this issue #6 is obsolete? What is planed to support there?

@4F2E4A2E
No, this task is about support interfaces in GraphQL schema:
http://graphql.org/learn/schema/#interfaces

I've only created the task issue but I haven't thought about the API design and use cases yet.
However I think it will look like this:

@GraphQLInterfaceType()
export abstract class Character {
  @Field(type => ID)
  id: string;

  @Field()
  name: string;

  @Field(type => Character)
  friends: Character[];

  @Field(type => Episode)
  appearsIn: Episode[];
}

@GraphQLObjectType()
export class Human implements Character {
  @Field(type => ID)
  id: string;

  @Field()
  name: string;

  @Field(type => Character)
  friends: Character[];

  @Field(type => Episode)
  appearsIn: Episode[];

  @Field(type => Starship)
  starships: Starship[];

  @Field(type => Int)
  totalCredits: number;
}

@GraphQLObjectType()
class Droid implements Character {
  @Field(type => ID)
  id: string;

  @Field()
  name: string;

  @Field(type => Character)
  friends: Character[];

  @Field(type => Episode)
  appearsIn: Episode[];

  @Field({ nullable: true })
  primaryFunction: string;
}

It is possible to do this without repeating the decorators:

@GraphQLObjectType({ implements: Character })
export class Human implements Character {
  id: string;
  name: string;
  friends: Character[];
  appearsIn: Episode[];

  @Field(type => Starship)
  starships: Starship[];

  @Field(type => Int)
  totalCredits: number;
}

However I'm not convinced it's a good choose. I prefer explicitness but decorator duplication means N times doing the same changes in every implementation so it's easy to make a mistake, but the correctness of interface implementation might be checked on schema-build time of course.
What do you think?

[4F2E4A2E]

I prefer explicitness too and the fact that you can duplicate decorators, but don't have too is just great and very useful in many cases, so thanks for that! 👍

[4F2E4A2E]

This is maybe worth noticing: graphql/graphql-js#1235