Lazy Types
Strawberry supports lazy types, which are useful when you have circular dependencies between types.
For example, let’s say we have a User
type that has a list of Post
types,
and each Post
type has a User
field. In this case, we can’t define the
User
type before the Post
type, and vice versa.
To solve this, we can use lazy types:
strawberry.lazy
in combination with Annotated
allows us to define the path
of the module of the type we want to use, this allows us to leverage Python’s
type hints, while preventing circular imports and preserving type safety by
using TYPE_CHECKING
to tell type checkers where to look for the type.
Annotated
is only available in Python 3.9+, if you are using an older version
of Python you can use typing_extensions.Annotated
instead.