Add subscriber hook for setting inbox count in template context.

tailbone/subscribers.py

@@ -1,9 +1,8 @@
-#!/usr/bin/env python
 # -*- coding: utf-8 -*-
 ################################################################################
 #
 #  Rattail -- Retail Software Framework
-#  Copyright © 2010-2012 Lance Edgar
+#  Copyright © 2010-2016 Lance Edgar
 #
 #  This file is part of Rattail.
 #
@@ -21,20 +20,23 @@
 #  along with Rattail.  If not, see <http://www.gnu.org/licenses/>.
 #
 ################################################################################
-
 """
 Event Subscribers
 """
 
-from pyramid import threadlocal
+from __future__ import unicode_literals, absolute_import
-import rattail
-from . import helpers
 
-from pyramid.security import authenticated_userid
+import rattail
-from .db import Session
+from rattail import enum
-from rattail.db.model import User
+from rattail.db import model
 from rattail.db.auth import has_permission
 
+from pyramid import threadlocal
+from pyramid.security import authenticated_userid
+
+from tailbone import helpers
+from tailbone.db import Session
+
 
 def add_rattail_config_attribute_to_request(event):
     """
@@ -78,6 +80,24 @@ def before_render(event):
     renderer_globals['rattail'] = rattail
 
 
+def add_inbox_count(event):
+    """
+    Adds the current user's inbox message count to the global renderer context.
+
+    Note that this is not enabled by default; to turn it on you must do this:
+
+       config.add_subscriber('tailbone.subscribers.add_inbox_count', 'pyramid.events.BeforeRender')
+    """
+    request = event.get('request') or threadlocal.get_current_request()
+    if request.user:
+        renderer_globals = event
+        renderer_globals['inbox_count'] = Session.query(model.Message)\
+                                                 .outerjoin(model.MessageRecipient)\
+                                                 .filter(model.MessageRecipient.recipient == Session.merge(request.user))\
+                                                 .filter(model.MessageRecipient.status == enum.MESSAGE_STATUS_INBOX)\
+                                                 .count()
+
+
 def context_found(event):
     """
     Attach some goodies to the request object.
@@ -96,7 +116,7 @@ def context_found(event):
     request.user = None
     uuid = authenticated_userid(request)
     if uuid:
-        request.user = Session.query(User).get(uuid)
+        request.user = Session.query(model.User).get(uuid)
         if request.user:
             Session().set_continuum_user(request.user)