avoid unnecessary cache invalidation of a django queryset

Author: Dmitry Marychev

.github/workflows/test.yml

@@ -16,8 +16,6 @@ jobs:
       max-parallel: 2
       matrix:
         include:
-          - python-version: "2.7"
-            toxenv: py27-django{1.10,1.11}
           - python-version: "3.6"
             toxenv: py36-django{1.10,1.11,2.0,2.1,2.2,3.0}
           - python-version: "3.7"

.travis.yml

@@ -1,8 +1,6 @@
 language: python
 matrix:
     include:
-        - python: 2.7
-          env: TOXENV="py27--django{1.11},flake8"
         - python: 3.6
           env: TOXENV="py36--django{1.11,2.0,2.1,2.2,3.0}"
         - python: 3.7

access_tastypie/__init__.py

@@ -1 +1 @@
-__version__ = "0.1.0b1"
+__version__ = "0.1.0b2"

access_tastypie/authorization.py

@@ -25,7 +25,9 @@ def read_detail(self, object_list, bundle):
         if self.check_able('visible', object_list.model, bundle.request) is False:
             return False
         if bundle.obj and bundle.obj.pk:
-            return bool(self.apply_able('visible', object_list.filter(pk=bundle.obj.pk), bundle.request))
+            # Read_detail() will always receive a queryset with a single object, no need
+            # to filter it once again. This preserves any cache inside object_list.
+            return bool(self.apply_able('visible', object_list, bundle.request))
         return True
 
     def update_list(self, object_list, bundle):

setup.py

@@ -74,8 +74,6 @@
 
         # Specify the Python versions you support here. In particular, ensure
         # that you indicate whether you support Python 2, Python 3 or both.
-        'Programming Language :: Python :: 2',
-        'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',

tox.ini

@@ -25,7 +25,7 @@ deps=
   django3.2: django>=3.2,<3.3
   django4.0: django>=4.0,<4.1
   django4.1: django>=4.1,<4.2
-  django4.2: django
+  django4.2: django>=4.2,<4.3
   mock
 
 [testenv:flake8]