Ruff: Add and fix PLW0604 (#11773)

Author: kiblik

ruff.toml

@@ -76,7 +76,7 @@ select = [
    "PLC01", "PLC0205", "PLC0208", "PLC0414", "PLC18", "PLC24", "PLC28", "PLC3",
    "PLE",
    "PLR01", "PLR02", "PLR04", "PLR0915", "PLR1716", "PLR172", "PLR1733", "PLR1736", "PLR5", "PLR6104", "PLR6201",
-   "PLW01", "PLW02", "PLW04", "PLW07", "PLW1", "PLW2", "PLW3",
+   "PLW01", "PLW02", "PLW04", "PLW0604", "PLW07", "PLW1", "PLW2", "PLW3",
    "TRY003", "TRY004", "TRY2", "TRY300", "TRY401",
    "FLY",
    "NPY",

unittests/test_rest_framework.py

@@ -1,3 +1,4 @@
+import functools
 import json
 import logging
 import pathlib
@@ -151,6 +152,7 @@
 REIMPORTER_MOCK_RETURN_VALUE = None, 0, 0, 0, 0, 0, MagicMock()
 
 
+@functools.cache
 def get_open_api3_json_schema():
     generator_class = spectacular_settings.DEFAULT_GENERATOR_CLASS
     generator = generator_class()
@@ -163,11 +165,6 @@ def get_open_api3_json_schema():
     return schema
 
 
-# use ugly global to avoid generating the schema for every test/method (as it's slow)
-global open_api3_json_schema
-open_api3_json_schema = get_open_api3_json_schema()
-
-
 def skipIfNotSubclass(baseclass):
     def decorate(f):
         def wrapper(self, *args, **kwargs):
@@ -363,7 +360,7 @@ def setUp(self):
             self.client = APIClient()
             self.client.credentials(HTTP_AUTHORIZATION="Token " + token.key)
             self.url = reverse(self.viewname + "-list")
-            self.schema = open_api3_json_schema
+            self.schema = get_open_api3_json_schema()
 
         def setUp_not_authorized(self):
             testuser = User.objects.get(id=3)
@@ -465,7 +462,7 @@ def test_detail_configuration_not_authorized(self):
     class ListRequestTest(RESTEndpointTest):
         @skipIfNotSubclass(ListModelMixin)
         def test_list(self):
-            # print(open_api3_json_schema)
+            # print(get_open_api3_json_schema())
             # validator = ResponseValidator(spec)
 
             check_for_tags = False