Update all the views so that they use the uploader reference instead

of uploader embedding

mediagoblin/db/models.py

@@ -127,17 +127,22 @@ class MediaEntry(Document):
 
         Use a slug if we have one, else use our '_id'.
         """
+        uploader = self.uploader()
+
         if self.get('slug'):
             return urlgen(
                 'mediagoblin.user_pages.media_home',
-                user=self['uploader']['username'],
+                user=uploader['username'],
                 media=self['slug'])
         else:
             return urlgen(
                 'mediagoblin.user_pages.media_home',
-                user=self['uploader']['username'],
+                user=uploader['username'],
                 media=unicode(self['_id']))
 
+    def uploader(self):
+        return self.db.User.find_one({'_id': self['uploader']})
+
 
 REGISTER_MODELS = [MediaEntry, User]