Add parent property to Filter

django_filters-stubs/filters.pyi

@@ -1,5 +1,7 @@
 from typing import Any, Callable, Optional
 
+from django_filters.filterset import FilterSet
+
 class Filter:
     creation_counter: int = ...
     field_class: Any = ...
@@ -22,6 +24,7 @@ class Filter:
     def get_method(self, qs: Any): ...
     method: Callable = ...
     label: Any = ...
+    parent: FilterSet = ...
     @property
     def field(self): ...
     def filter(self, qs: Any, value: Any): ...

django_filters-stubs/filterset.pyi

@@ -1,4 +1,4 @@
-from typing import Any, Optional
+from typing import Any, Dict, Optional
 
 from .conf import settings
 from .constants import ALL_FIELDS
@@ -44,7 +44,7 @@ class BaseFilterSet:
     queryset: Any = ...
     request: Any = ...
     form_prefix: Any = ...
-    filters: Any = ...
+    filters: Dict[str, Filter] = ...
     def __init__(
         self,
         data: Optional[Any] = ...,

requirements.in

@@ -4,4 +4,7 @@ black
 flake8
 isort
 pytest-mypy-plugins
-pip-tools
+pip-tools
+
+django-filter
+pytest-watch

requirements.txt

@@ -24,12 +24,17 @@ click==8.1.3
     # via
     #   black
     #   pip-tools
+colorama==0.4.6
+    # via pytest-watch
 decorator==5.1.1
     # via pytest-mypy-plugins
 django==3.2.16
     # via
+    #   django-filter
     #   django-stubs
     #   django-stubs-ext
+django-filter==22.1
+    # via -r requirements.in
 django-stubs==1.13.1
     # via
     #   django-filter-stubs
@@ -38,6 +43,8 @@ django-stubs-ext==0.7.0
     # via django-stubs
 djangorestframework-stubs==1.8.0
     # via django-filter-stubs
+docopt==0.6.2
+    # via pytest-watch
 exceptiongroup==1.1.0
     # via pytest
 flake8==5.0.4
@@ -87,9 +94,13 @@ pycodestyle==2.9.1
 pyflakes==2.5.0
     # via flake8
 pytest==7.2.0
-    # via pytest-mypy-plugins
+    # via
+    #   pytest-mypy-plugins
+    #   pytest-watch
 pytest-mypy-plugins==1.10.1
     # via -r requirements.in
+pytest-watch==4.2.0
+    # via -r requirements.in
 pytz==2022.7
     # via django
 pyyaml==6.0
@@ -124,6 +135,7 @@ types-urllib3==1.26.25.4
     # via types-requests
 typing-extensions==4.4.0
     # via
+    #   asgiref
     #   black
     #   django-filter-stubs
     #   django-stubs
@@ -134,6 +146,8 @@ typing-extensions==4.4.0
     #   platformdirs
 urllib3==1.26.13
     # via requests
+watchdog==2.3.1
+    # via pytest-watch
 wheel==0.38.4
     # via pip-tools
 zipp==3.11.0

tests/test_filter.yml

@@ -0,0 +1,22 @@
+- case: filter_has_parent_property
+  main: |
+    from myapp.models import ProductFilter
+    name = ProductFilter().filters["name"]
+    reveal_type(name) # N: Revealed type is "django_filters.filters.Filter" 
+    reveal_type(name.parent) # N: Revealed type is "django_filters.filterset.FilterSet" 
+  files:
+    - path: myapp/__init__.py
+    - path: myapp/models.py
+      content: |
+        from django.db import models
+        import django_filters
+
+        class Product(models.Model):
+            name = models.CharField(max_length=255)
+
+        class ProductFilter(django_filters.FilterSet):
+            name = django_filters.CharFilter()
+
+            class Meta:
+                model = Product
+                fields = ['name']