Generated GraphQL query is missing fragments

[dhay]

Similar to this issue, I'm seeing the generated GQL query for my mutation missing the associated fragments.

Given the following schema (sample-schema.graphql)

type Item {
  id: ID
}

type ItemResult {
  contacts: [Item!]
  errors: [ItemServiceError!]
}

interface ItemError {
  message: String!
}

union ItemServiceError = ItemServiceInternalError

type ItemServiceInternalError implements ItemError {
  message: String!
}

type Mutation {
  change_item(id: ID!): ItemResult
}

and the given queries file (sample-queries.graphql):

fragment Item on Item {
    id
}

fragment ItemError on ItemError {
    __typename
    message
}

mutation my_mutation($id: ID!) {
    change_item(id: $id) {
        contacts {
            ...Item
        }
        errors {
            ... on ItemError {
                ...ItemError
            }
        }
    }
}

Using the following config file (sample.toml)

[tool.ariadne-codegen]
schema_path = "sample-schema.graphql"
queries_path = "sample-queries.graphql"

When I run the codegen (version 0.13.0) as follows

ariadne-codegen --config sample.toml

The generated code in client.py is missing the ItemError fragment definition:

class Client(AsyncBaseClient):
    async def my_mutation(self, id: str, **kwargs: Any) -> MyMutation:
        query = gql(
            """
            mutation my_mutation($id: ID!) {
              change_item(id: $id) {
                contacts {
                  ...Item
                }
                errors {
                  __typename
                  ... on ItemError {
                    ...ItemError
                  }
                }
              }
            }

            fragment Item on Item {
              id
            }
            """
        )
        variables: Dict[str, object] = {"id": id}
        response = await self.execute(
            query=query, operation_name="my_mutation", variables=variables, **kwargs
        )
        data = self.get_data(response)
        return MyMutation.model_validate(data)

[dhay]

I'm also noticing that the fields in the ItemError are not being defined on the model. The code generated looks like this:

class MyMutationChangeItemErrorsItemServiceInternalError(BaseModel):
    typename__: Literal["ItemServiceInternalError"] = Field(alias="__typename")

If I remove the ItemError fragment, the GraphQL code is generated correctly, but the message field is still missing from the MyMutationChangeItemErrorsItemServiceInternalError class.