Subgraph: "'NoneType' object has no attribute '...'"

[dgram]

When i make use of subgraphs i can start the graphql server, also the docs generated successfully but when i execute a query i get the error "'NoneType' object has no attribute '...'"

@strawberry.type
class TestType:
    name: str

@strawberry.type
class TestQuery:
    @strawberry.field()
    async def test() -> TestType:
        return TestType(name="test")

@strawberry.type
class Query:
    sub: TestQuery = strawberry.field(default_factory=TestQuery)

graphql_app = GraphQL(
    strawberry.Schema(
        query=Query
    )
)
# ... other fastapi graphql connection here

# query
query MyQuery {
  sub {
    test {
      name
    }
  }
}

System Information

• Operating system: MacOS
• Strawberry version: 0.229.1

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[patrick91]

@dgram to make this work you need to have a root value 😊 we don't instantiate the query type 😊

https://strawberry.rocks/docs/integrations/fastapi#root_value_getter

[dgram]

hey @patrick91 thanks for your response, what did you mean with this? i can't found an answer about this case

[patrick91]

@dgram there's an example here: https://strawberry.rocks/docs/integrations/asgi#get_root_value

[dgram]

thanks, i've found the answer. because i don't have any fields to set per default this is the right answer.

@strawberry.type
class Query:
    sub: TestQuery = strawberry.field(resolver=lambda: TestQuery())