Long term fix for the 1.2.8 App Engine update that broke Bloog code

models/__init__.py

@@ -118,13 +118,30 @@ def to_json(self, attr_list=[]):
         def to_entity(entity):
             """Convert datastore types in entity to 
                JSON-friendly structures."""
-            self._to_entity(entity)
+            my_to_entity(self, entity)
             for skipped_property in self.__class__.json_does_not_include:
                 del entity[skipped_property]
             replace_datastore_types(entity)
         values = to_dict(self, attr_list, to_entity)
         return simplejson.dumps(values)
 
+def my_to_entity(self, entity):
+    """Copies information from this model to provided entity.
+
+    Args:
+    entity: Entity to save information on.
+    """
+    for prop in self.properties().values():
+        logging.debug("copying prop: " + prop.name)
+        datastore_value = prop.get_value_for_datastore(self)
+        if datastore_value == []:
+            try:
+                del entity[prop.name]
+            except KeyError:
+                pass
+        else:
+            entity[prop.name] = datastore_value
+
 class MemcachedModel(SerializableModel):
     """MemcachedModel adds memcached all() retrieval through list().
     
@@ -147,9 +164,19 @@ def put(self):
         memcache.delete(self.__class__.memcache_key())
         return key
 
+    def to_entity(entity):
+        """Convert datastore types in entity to 
+        JSON-friendly structures."""
+        self._to_entity(entity)
+        logging.debug(dir(self.__class__))
+        for skipped_property in self.__class__.json_does_not_include:
+            del entity[skipped_property]
+        replace_datastore_types(entity)
+        values = to_dict(self, attr_list, to_entity)
+
     def _to_repr(self):
         return repr(to_dict(self, self.__class__.list_includes, 
-                    self._to_entity))
+                    my_to_entity(self)))
 
     @classmethod
     def get_or_insert(cls, key_name, **kwds):

view.py

@@ -169,8 +169,7 @@ def full_render(self, handler, template_info, more_params):
             NUM_FULL_RENDERS[path] = 0
         NUM_FULL_RENDERS[path] += 1     # This lets us see % of cached views
                                         # in /admin/timings (see timings.py)
-        #tags = Tag.list()
-        tags = None
+        tags = Tag.list()
         years = Year.get_all_years()
 
         # Define some parameters it'd be nice to have in views by default.