feat: support strawberry 0.199.0+ (#326)

strawberry 0.199.0 changed the way generic type vars are handled
to support the new generic syntax in Python 3.12.

This release adjusts our usage of generic type vars to match the
new behaviour.

Fix #325

pyproject.toml

@@ -34,7 +34,7 @@ classifiers = [
 [tool.poetry.dependencies]
 python = ">=3.8,<4.0"
 Django = ">=3.2"
-strawberry-graphql = ">=0.198.0"
+strawberry-graphql = ">=0.199.0"
 django-debug-toolbar = { version = ">=3.4", optional = true }
 django-choices-field = { version = ">=2.2.2", optional = true }
 

strawberry_django/fields/base.py

@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 import functools
-from typing import TYPE_CHECKING, Any, Optional, TypeVar, cast
+from typing import TYPE_CHECKING, Any, Optional, TypeVar
 
 from strawberry import LazyType, relay
 from strawberry.annotation import StrawberryAnnotation
@@ -72,14 +72,14 @@ def django_type(self) -> type[WithStrawberryDjangoObjectDefinition] | None:
         object_definition = get_object_definition(origin)
 
         if object_definition and issubclass(object_definition.origin, relay.Connection):
-            origin = object_definition.type_var_map.get(cast(TypeVar, relay.NodeType))
+            origin = object_definition.type_var_map.get(relay.NodeType.__name__)
 
             if origin is None:
                 specialized_type_var_map = (
                     object_definition.specialized_type_var_map or {}
                 )
 
-                origin = specialized_type_var_map[cast(TypeVar, relay.NodeType)]
+                origin = specialized_type_var_map[relay.NodeType.__name__]
 
             if isinstance(origin, LazyType):
                 origin = origin.resolve_type()

strawberry_django/optimizer.py

@@ -324,11 +324,11 @@ def _get_model_hints(
         if level > 0:
             return None
 
-        n_type = object_definition.type_var_map.get(cast(TypeVar, relay.NodeType))
+        n_type = object_definition.type_var_map.get(relay.NodeType.__name__)
         if n_type is None:
             specialized_type_var_map = object_definition.specialized_type_var_map or {}
 
-            n_type = specialized_type_var_map[cast(TypeVar, relay.NodeType)]
+            n_type = specialized_type_var_map[relay.NodeType.__name__]
         if isinstance(n_type, LazyType):
             n_type = n_type.resolve_type()
 

strawberry_django/utils/inspect.py

@@ -95,7 +95,7 @@ def get_possible_types(
     elif isinstance(gql_type, LazyType):
         yield from get_possible_types(gql_type.resolve_type())
     elif isinstance(gql_type, StrawberryTypeVar) and object_definition is not None:
-        resolved = object_definition.type_var_map.get(gql_type.type_var, None)
+        resolved = object_definition.type_var_map.get(gql_type.type_var.__name__, None)
         if resolved is not None:
             yield from get_possible_types(resolved)
     elif isinstance(gql_type, StrawberryContainer):