Use the controller's symbolic/lookup name as part of the key for context hooks

This commit sponsored by David Collins.  Thank you!

mediagoblin/app.py

@@ -201,9 +201,9 @@ class MediaGoblinApp(object):
                 exc.get_description(environ))(environ, start_response)
 
         controller = endpoint_to_controller(found_rule)
-        # Make a reference to the controller on the request...
+        # Make a reference to the controller's symbolic name on the request...
         # used for lazy context modification
-        request.controller = controller
+        request.controller_name = found_rule.endpoint
 
         # pass the request through our meddleware classes
         try:

mediagoblin/tools/template.py

@@ -107,7 +107,7 @@ def render_template(request, template_path, context):
 
     # allow plugins to do things to the context
     context = hook_transform(
-        (request.controller, template_path),
+        (request.controller_name, template_path),
         context)
 
     rendered = template.render(context)