Perform anal_type for arguments and return type when copying methods to another class (#279)

* Found the reproducible test case

* fix import resolution for method copy

* remove irrelevant parts from test

* fix mypy errors

Co-authored-by: Boger <[email protected]>

Author: mkurnikov

mypy_django_plugin/lib/helpers.py

@@ -327,6 +327,14 @@ def _prepare_new_method_arguments(node: FuncDef) -> Tuple[List[Argument], MypyTy
 def copy_method_to_another_class(ctx: ClassDefContext, self_type: Instance,
                                  new_method_name: str, method_node: FuncDef) -> None:
     arguments, return_type = _prepare_new_method_arguments(method_node)
+
+    semanal_api = get_semanal_api(ctx)
+    for argument in arguments:
+        if argument.type_annotation is not None:
+            argument.type_annotation = semanal_api.anal_type(argument.type_annotation)
+    if return_type is not None:
+        return_type = semanal_api.anal_type(return_type) or AnyType(TypeOfAny.unannotated)
+
     add_method(ctx,
                new_method_name,
                args=arguments,

test-data/typecheck/managers/querysets/test_from_queryset.yml

@@ -117,3 +117,32 @@
               NewManager = BaseManager.from_queryset(ModelQuerySet)
               class MyModel(models.Model):
                   objects = NewManager()
+
+-   case: from_queryset_with_manager_in_another_directory_and_imports
+    main: |
+        from myapp.models import MyModel
+        reveal_type(MyModel().objects)  # N: Revealed type is 'myapp.models.MyModel_NewManager[myapp.models.MyModel]'
+        reveal_type(MyModel().objects.get())  # N: Revealed type is 'myapp.models.MyModel*'
+        reveal_type(MyModel().objects.queryset_method)  # N: Revealed type is 'def (param: Union[builtins.str, None] =) -> Union[builtins.str, None]'
+        reveal_type(MyModel().objects.queryset_method('str'))  # N: Revealed type is 'Union[builtins.str, None]'
+    installed_apps:
+        - myapp
+    files:
+        -   path: myapp/__init__.py
+        -   path: myapp/models.py
+            content: |
+                from django.db import models
+                from myapp.managers import NewManager
+
+                class MyModel(models.Model):
+                    objects = NewManager()
+        -   path: myapp/managers.py
+            content: |
+                from typing import Optional
+                from django.db import models
+
+                class ModelQuerySet(models.QuerySet):
+                    def queryset_method(self, param: Optional[str] = None) -> Optional[str]:
+                        return param
+
+                NewManager = models.Manager.from_queryset(ModelQuerySet)