Composition error with @interfaceObject

[zoontek]

Hi folks! 👋

We are currently trying to migrate from Apollo GraphOS to Hive and it works mostly great, except for one thing: we use @interfaceObject in one place, and it doesn't appear to compose.

If we follow the Apollo example here and use those schemas:

# a.gql

directive @interfaceObject on OBJECT

extend schema
  @link(
    url: "https://specs.apollo.dev/federation/v2.6"
    import: ["@key", "@interfaceObject"]
  )

interface Media @key(fields: "id") {
  id: ID!
  title: String!
}

type Book implements Media @key(fields: "id") {
  id: ID!
  title: String!
}

# b.gql

directive @interfaceObject on OBJECT

extend schema
  @link(
    url: "https://specs.apollo.dev/federation/v2.6"
    import: ["@key", "@interfaceObject"]
  )

type Media @key(fields: "id") @interfaceObject {
  id: ID!
  reviews: [Review!]!
}

type Review {
  score: Int!
}

type Query {
  topRatedMedia: [Media!]!
}

They will not compose ❌:

[
  GraphQLError: The following supergraph API query:
  {
    topRatedMedia {
      ... on Book {
        reviews {
          ...
        }
      }
    }
  }
  cannot be satisfied by the subgraphs because:
  - from subgraph "a": cannot find field "Book.reviews".
      at check (file:///Users/zoontek/Projects/swan/interface-object-issue/node_modules/@theguild/federation-composition/esm/supergraph/validation/rules/satisfiablity-rule.js:56:33)
      at file:///Users/zoontek/Projects/swan/interface-object-issue/node_modules/@theguild/federation-composition/esm/supergraph/validation/rules/satisfiablity-rule.js:83:62
      at Set.forEach (<anonymous>)
      at Object.InterfaceTypeField (file:///Users/zoontek/Projects/swan/interface-object-issue/node_modules/@theguild/federation-composition/esm/supergraph/validation/rules/satisfiablity-rule.js:83:42)
      at file:///Users/zoontek/Projects/swan/interface-object-issue/node_modules/@theguild/federation-composition/esm/supergraph/composition/visitor.js:53:29
      at Map.forEach (<anonymous>)
      at visitSupergraphState (file:///Users/zoontek/Projects/swan/interface-object-issue/node_modules/@theguild/federation-composition/esm/supergraph/composition/visitor.js:44:36)
      at validateSupergraph (file:///Users/zoontek/Projects/swan/interface-object-issue/node_modules/@theguild/federation-composition/esm/supergraph/validation/validate-supergraph.js:74:5)
      at validate (file:///Users/zoontek/Projects/swan/interface-object-issue/node_modules/@theguild/federation-composition/esm/validate.js:118:30)
      at composeServices (file:///Users/zoontek/Projects/swan/interface-object-issue/node_modules/@theguild/federation-composition/esm/compose.js:13:30) {
    path: undefined,
    locations: undefined,
    extensions: { code: 'SATISFIABILITY_ERROR' }
  }
]

👉 If you want to reproduce the error quickly, clone this repository

[kamilkisiela]

@zoontek It's now live on app.graphql-hive.com