The problem occurs when using new-style lazy annotations (with from __future__ import annotations) wrapped into a List[]:

# c.py
@strawberry.type
class C:
    id: strawberry.ID

# d.py
from __future__ import annotations

from typing import TYPE_CHECKING, List
from typing_extensions import Annotated

import strawberry

if TYPE_CHECKING:
    from tests.c import C

@strawberry.type
class D:
    id: strawberry.ID

    @strawberry.field
    async def c_list(self) -> List[Annotated[C, strawberry.lazy("tests.c")]]:
        ...

Error:

E strawberry.exceptions.unresolved_field_type.UnresolvedFieldTypeError:
Could not resolve the type of 'c_list'. Check that the class is accessible from the global module scope.

strawberry/schema/schema_converter.py:321: UnresolvedFieldTypeError

However, if you add another field, which is just Annotated[C, ...], everything is fine:

@strawberry.type
class D:
    id: strawberry.ID

    @strawberry.field
    async def c(self) -> Annotated[C, strawberry.lazy("tests.c")]:
        ...

    @strawberry.field
    async def c_list(self) -> List[Annotated[C, strawberry.lazy("tests.c")]]:
        ...

Also, it works as expected with the old-school annotations, List[Annotated["C", ...]]. I added all the necessary test cases in #2895.

Related PR with the feature:

• #2744

System Information

• Operating system: macOS 13.4.1 (doesn't actually matter)
• Strawberry version (if applicable): 0.190.0