Apollo-android: fieldA cannot be merged with fieldB: they have different shapes

[TonnyL]

Summary
Error info: Failed to parse path-to-graphql-file:
fieldA cannot be merged with fieldB: they have different shapes

Here fieldA has the same name with fieldB, but different nullability.

Version

• apollo-android: 3.0.0-SNAPSHOT
• Android Studio: Android Studio Arctic Fox | 2020.3.1 Canary 10
• Gradle: 6.8.2

Description

• Content of my graphql file:

fragment PinnableItem on PinnableItem {
  __typename
   # https://docs.github.com/en/graphql/reference/objects#repository
  ... on Repository {
    owner {
      ... on RepositoryOwner { # non-null
        # A URL pointing to the owner's public avatar.
        avatarUrl
        # The username used to login.
        login
        # The HTTP URL for the owner.
        resourcePath
        # The HTTP URL for the owner.
        url
      }
    }
  }
  # https://docs.github.com/en/graphql/reference/objects#gist
  ... on Gist {
    owner {
      ... on RepositoryOwner { # nullable
        # A URL pointing to the owner's public avatar.
        avatarUrl
        # The username used to login.
        login
        # The HTTP URL for the owner.
        resourcePath
        # The HTTP URL for the owner.
        url
      }
    }
  }
}

• Where to download the schema definition file:
  https://docs.github.com/public/schema.docs.graphql

• Screenshot of detailed error information:
  

[martinbonnin]

Hi @TonnyL 👋 ! I think this is how it is supposed to work? From https://spec.graphql.org/June2018/#sec-Field-Selection-Merging:

If typeA or typeB is Non‐Null.
If typeA or typeB is nullable, return false.
Let typeA be the nullable type of typeA
Let typeB be the nullable type of typeB

Does it actually work in the Github explorer?

[TonnyL]

Thanks for the quick response, you saved my day!

My code above doesn't work in Github explore. But it actually works on an old stable version(2.5.3) of apollo-android. So I thought it might be a bug of new version of apollo-android 😂. Anyway, my problem solved, really appreciate ❤️.

[martinbonnin]

Sure thing !