strawberry.Parent not supporting forward refs

[andrewkruse]

I would like the strawberry documentation on accessing parent with function resolvers on this page tweaked to be more clear, or maybe corrected?

From what I understand in the docs, its suggesting you end up with the following. However, this doesn't even run? I have tried swapping the definitions both directions, they have the same issue. I had to resort to the self method on a method resolver, which seems less desirable to me since the docs specifically call out that it might not work quite right everywhere.

and it works like it should in Python, but there might be cases where it doesn’t properly follow Python’s semantics

def get_full_name(parent: strawberry.Parent[User2]) -> str:
    return f"{parent.first_name} {parent.last_name}"

@strawberry.type
class User2:
    first_name: str
    last_name: str
    full_name: str = strawberry.field(resolver=get_full_name)

Traceback (most recent call last):
  File "/Users/.../Library/Application Support/JetBrains/IntelliJIdea2024.1/plugins/python/helpers/pydev/pydevd.py", line 1535, in _exec
    pydev_imports.execfile(file, globals, locals)  # execute the script
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/.../Library/Application Support/JetBrains/IntelliJIdea2024.1/plugins/python/helpers/pydev/_pydev_imps/_pydev_execfile.py", line 18, in execfile
    exec(compile(contents+"\n", file, 'exec'), glob, loc)
  File "/Users/.../src/api/python-graphql-poc/src/main.py", line 21, in <module>
    def get_full_name(parent: strawberry.Parent[User2]) -> str:
                                                ^^^^^
NameError: name 'User2' is not defined

Perhaps there's a quirk in here where the structure of my file is part of the problem since everything is top level? I am using FastAPI, uvicorn and strawberry.

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[patrick91]

@andrewkruse I think you found a bug, this should work:

from __future__ import annotations   # NOTE: this

import strawberry


def get_full_name(user: strawberry.Parent[User]) -> str:
    return f"{user.first_name} {user.last_name}"


@strawberry.type
class User:
    first_name: str
    last_name: str
    full_name: str = strawberry.field(resolver=get_full_name)


@strawberry.type
class Query:
    @strawberry.field
    def user(self) -> User:
        return User(first_name="John", last_name="Doe")


schema = strawberry.Schema(query=Query)

but it doesn't work