Ticket 5815 per view cache invalidation2

django/utils/cache.py

@@ -347,7 +347,9 @@ def _i18n_cache_key_suffix(request, cache_key):
 
 
 def _generate_cache_key(request, method, headerlist, key_prefix):
-    """Return a cache key from the headers given in the header list."""
+    """
+    Return a cache key from the headers given in the header list.
+    """
     ctx = md5(usedforsecurity=False)
     for header in headerlist:
         value = request.META.get(header)

tests/cache/tests.py

@@ -2466,6 +2466,8 @@ def hello_world_view(request, value):
 def csrf_view(request):
     return HttpResponse(csrf(request)["csrf_token"])
 
+def invalidate_cache_from_uri(uri):
+    pass
 
 @override_settings(
     CACHE_MIDDLEWARE_ALIAS="other",
@@ -2578,6 +2580,29 @@ def test_middleware(self):
         self.assertIsNotNone(result)
         self.assertEqual(result.content, b"Hello World 1")
 
+
+    def test_view_cache_invalidation(self):
+        default_view = cache_page(3)(hello_world_view)
+        request = self.factory.get("/view/")
+
+        # Request the view once
+        response = default_view(request, "1")
+        self.assertEqual(response.content, b"Hello World 1")
+
+        # Request again -- hit the cache
+        response = default_view(request, "2")
+        self.assertEqual(response.content, b"Hello World 1")
+
+        # invalidate the cache for the view
+        uri = request.build_absolute_uri().encode("ascii")
+        print(uri)
+        invalidate_cache_from_uri(uri)
+
+
+        # Request again -- do not hit the cache
+        response = default_view(request, "3")
+        self.assertEqual(response.content, b"Hello World 3")
+
     def test_view_decorator(self):
         # decorate the same view with different cache decorators
         default_view = cache_page(3)(hello_world_view)