Fragment on <interface> not working

[Sander0542]

When I am using a fragment which implements on an interface, the query doesn't get generated with that part

interface IUser {
    id: ID!
}

type User implements IUser {
    id: ID!
}

type Location {
    id: ID!

    users: [User!]!
}

type Query {
    locations: [Location!]!
}

fragment UserSummary on IUser {
    id
}

fragment LocationWithUsers on Location {
    id
    users {
        ...UserSummary
    }
}

query GetLocations {
    locations {
        ...LocationWithUsers
    }
}

[budde377]

Thanks for reporting this. I haven't been able to reproduce your issue (please take a look at the referenced PR). You do seem to have an error in your fragment as well:

fragment PersonSummary on IPerson {
  id: ID!
}

should probably be

fragment PersonSummary on IPerson {
  id
}

Some information that might be useful to help me help you is:

• What version of graphql_codegen are you using?
• Examples of generated code
• Potential build errors.

[Sander0542]

graphql_codegen version: 0.10.3

Sorry, the schema I proved works. It happens when I am using nested fragments.

interface IUser {
    id: ID!
}

type User implements IUser {
    id: ID!
}

type Location {
    id: ID!

    users: [User!]!
}

type Query {
    locations: [Location!]!
}

fragment UserSummary on IUser {
    id
}

fragment LocationWithUsers on Location {
    id
    users {
        ...UserSummary
    }
}

query GetLocations {
    locations {
        ...LocationWithUsers
    }
}

(I updated the schema on the initial post too)

When the query is sent to the server, it doesn't contain all the required properties from the person summary except the __typename

---

When I add the id field to the fragment it works.

fragment LocationWithUsers on Location {
    id
    users {
        id
        ...UserSummary
    }
}

[Sander0542]

I have a feeling this comment could be the issue zino-hofmann/graphql-flutter#994 (comment)

[budde377]

So is this a problem with the data not being sent to/from your server on runtime, or the built serialisers?

[Sander0542]

The query that gets sent to the server doesn't contain the required information like users.id

[budde377]

This library shouldn’t be manipulating your queries, can you elaborate a bit on what you mean by

query that gets sent to the server doesn't contain the required

information

…

On Tue, 9 Aug 2022 at 16:22, Sander Jochems ***@***.***> wrote: The query that gets sent to the server doesn't contain the required information like users.id — Reply to this email directly, view it on GitHub <#158 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AA2UFSZESTT64FI7UHYOYIDVYJSTHANCNFSM556QSKAQ> . You are receiving this because you commented.Message ID: ***@***.***>

[Sander0542]

The query that should get sent to the server is

query GetLocations {
  locations {
    __typename
    users {
       __typename
      id
    }
  }
}

But the query that is sent is

query GetLocations {
  locations {
    __typename
    users {
      __typename
    }
  }
}

[budde377]

Cheers. The library does no such changes to queries.

Please make sure you've rebuild your serialisers. If this doesn't work please share the generated file + the original query + an example on how you're calling the query.

[budde377]

I'm going to close this issue for now. Let's revisit if you have more information.