Looked up the template_fragments cache at runtime.

django/templatetags/cache.py

@@ -1,16 +1,11 @@
 from __future__ import unicode_literals
 
-from django.core.cache import caches, InvalidCacheBackendError
+from django.core.cache import cache, caches, InvalidCacheBackendError
 from django.core.cache.utils import make_template_fragment_key
 from django.template import Library, Node, TemplateSyntaxError, VariableDoesNotExist
 
 register = Library()
 
-try:
-    default_cache = caches['template_fragments']
-except InvalidCacheBackendError:
-    from django.core.cache import cache as default_cache
-
 
 class CacheNode(Node):
     def __init__(self, nodelist, expire_time_var, fragment_name, vary_on, cache_name):
@@ -35,17 +30,21 @@ class CacheNode(Node):
             except VariableDoesNotExist:
                 raise TemplateSyntaxError('"cache" tag got an unknown variable: %r' % self.cache_name.var)
             try:
-                cache = caches[cache_name]
+                fragment_cache = caches[cache_name]
             except InvalidCacheBackendError:
                 raise TemplateSyntaxError('Invalid cache name specified for cache tag: %r' % cache_name)
         else:
-            cache = default_cache
+            try:
+                fragment_cache = caches['template_fragments']
+            except InvalidCacheBackendError:
+                fragment_cache = caches['default']
+
         vary_on = [var.resolve(context) for var in self.vary_on]
         cache_key = make_template_fragment_key(self.fragment_name, vary_on)
-        value = cache.get(cache_key)
+        value = fragment_cache.get(cache_key)
         if value is None:
             value = self.nodelist.render(context)
-            cache.set(cache_key, value, expire_time)
+            fragment_cache.set(cache_key, value, expire_time)
         return value
 
 

tests/template_tests/tests.py

@@ -514,7 +514,7 @@ class TemplateRegressionTests(TestCase):
         o2 = t2.render(ctx)
 
         self.assertEqual(o1, 'foo')
-        self.assertNotEqual(o1, o2)
+        self.assertEqual(o2, 'bar')
 
     def test_cache_missing_backend(self):
         """