Fixed template block inheritance bug (issues 77 and 97)

Author: robhudson

NEWS

@@ -4,6 +4,8 @@ News for django-debug-toolbar
 develop
 -------
 
+* Fixed template block inheritance bug (issues 77 and 97).
+
 * Fixed flash of unstyled toolbar.
 
 * Updated to work with old TEMPLATE_LOADERS settings from < 1.2.

debug_toolbar/panels/template.py

@@ -19,9 +19,16 @@
 # e-mail interception, which we don't want
 from django.test.utils import instrumented_test_render
 from django.template import Template
-if Template.render != instrumented_test_render:
-    Template.original_render = Template.render
-    Template.render = instrumented_test_render
+
+if not hasattr(Template, '_render'): # Django < 1.2
+    if Template.render != instrumented_test_render:
+        Template.original_render = Template.render
+        Template.render = instrumented_test_render
+else:
+    if Template._render != instrumented_test_render:
+        Template.original_render = Template._render
+        Template._render = instrumented_test_render
+
 # MONSTER monkey-patch
 old_template_init = Template.__init__
 def new_template_init(self, template_string, origin=None, name='<Unknown Template>'):