Strawberry GraphQL @ 0.334.4

Released October 13, 2026 at 2:23 PM GMT+00:00

This release fixes the types of fields inherited from generic types, when the generic types use the same name for their type parameters, or when they’re given a type like list[T] or User | None .

Strawberry looked up type parameters by name across all the generic types a type extends, so when two of them called their type parameter T , the fields of both got the type given to the first one:

T = TypeVar("T")
 
 
@strawberry.type
class Page(Generic[T]):
    items: list[T]
 
 
@strawberry.type
class Sorted(Generic[T]):
    sorted_by: T
 
 
@strawberry.type
class UserPage(Page[User], Sorted[UserOrder]):  # `sortedBy` was `User!`
    pass

Each inherited field now gets the type given to the generic type that declares it, so sortedBy is UserOrder! . This also fixes types that are given to a type parameter wrapped in a list or an optional:

@strawberry.type
class Result(Generic[T]):
    data: T
 
 
@strawberry.type
class ListResult(Result[list[T]], Generic[T]):
    total: int
 
 
@strawberry.type
class UserListResult(ListResult[User]):  # `data` was `User!`, now `[User!]!`
    pass
 
 
@strawberry.type
class MaybeUserPage(Page[User | None]):  # failed, now `items: [User]!`
    pass

This release was contributed by @patrick91 in https://github.com/strawberry-graphql/strawberry/pull/4704