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Create related managers from generated managers (#580)

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This commit is contained in:
Konstantin Alekseev
2021-04-07 11:37:28 +03:00
committed by GitHub
parent cd9ef6cdd4
commit 9beb5327de
3 changed files with 74 additions and 4 deletions
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24
mypy_django_plugin/transformers/models.py
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@@ -275,6 +275,8 @@ class AddRelatedManagers(ModelClassInitializer):
# create new RelatedManager subclass
parametrized_related_manager_type = Instance(related_manager_info, [Instance(related_model_info, [])])
default_manager_type = related_model_info.names["objects"].type
if default_manager_type is None:
default_manager_type = self.try_generate_related_manager(related_model_cls, related_model_info)
if (
default_manager_type is None
or not isinstance(default_manager_type, Instance)
@@ -283,12 +285,32 @@ class AddRelatedManagers(ModelClassInitializer):
self.add_new_node_to_model_class(attname, parametrized_related_manager_type)
continue
name = related_model_cls.__name__ + "_" + "RelatedManager"
name = model_cls.__name__ + "_" + related_model_cls.__name__ + "_" + "RelatedManager"
bases = [parametrized_related_manager_type, default_manager_type]
new_related_manager_info = self.add_new_class_for_current_module(name, bases)
self.add_new_node_to_model_class(attname, Instance(new_related_manager_info, []))
def get_generated_manager_mappings(self, base_manager_fullname: str) -> Dict[str, str]:
base_manager_info = self.lookup_typeinfo(base_manager_fullname)
if base_manager_info is None or "from_queryset_managers" not in base_manager_info.metadata:
return {}
return base_manager_info.metadata["from_queryset_managers"]
def try_generate_related_manager(
self, related_model_cls: Type[Model], related_model_info: TypeInfo
) -> Optional[Instance]:
manager = related_model_cls._meta.managers_map["objects"]
base_manager_fullname = helpers.get_class_fullname(manager.__class__.__bases__[0])
manager_fullname = helpers.get_class_fullname(manager.__class__)
generated_managers = self.get_generated_manager_mappings(base_manager_fullname)
if manager_fullname in generated_managers:
real_manager_fullname = generated_managers[manager_fullname]
manager_info = self.lookup_typeinfo(real_manager_fullname) # type: ignore
if manager_info:
return Instance(manager_info, [Instance(related_model_info, [])])
return None
class AddExtraFieldMethods(ModelClassInitializer):
def run_with_model_cls(self, model_cls: Type[Model]) -> None: