Can a GraphQL input type inherit from another type or interface?

Question

Is it possible to use inheritance with GraphQL input types?

Something like that (this, of course, doesn\'t work with input types):

interface UserInpu         


        

Answer 1

If you came here looking for an explanation for the "implements", keyword, here it is:

An object type must be a super‐set of all interfaces it implements. The object type must include a field of the same name for every field defined in an interface.

(Excerpt taken from the June 2018 GraphQL spec.)

Here's an example

interface Foo {
  id: ID!
  foo: Int!
}

type Bar implements Foo @entity {
  id: ID!;
  foo: Int!;
  bar: Int!;
}

So the Bar type doesn't inherit from the Foo interface, but it implements it. The former must include all the fields that are listed in the latter.

I think that this is a nice way to annotate types that should be like other types.