--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/app/soc/logic/model.py	Sat Sep 13 22:00:51 2008 +0000
@@ -0,0 +1,56 @@
+#!/usr/bin/python2.5
+#
+# Copyright 2008 the Melange authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Helpers functions for updating different kinds of models in datastore.
+"""
+
+__authors__ = [
+  '"Pawel Solyga" <pawel.solyga@gmail.com>',
+  ]
+
+from google.appengine.ext import db
+
+def updateModelProperties(model, **model_properties):
+  """Update existing model entity using supplied model properties.
+
+  Args:
+    model: a model entity
+    **model_properties: keyword arguments that correspond to model entity
+      properties and their values
+
+  Returns:
+    the original model entity with any supplied properties changed 
+  """
+  def update():
+    return _unsafeUpdateModelProperties(model, **model_properties)
+
+  return db.run_in_transaction(update)
+
+
+def _unsafeUpdateModelProperties(model, **model_properties):
+  """(see updateModelProperties)
+
+  Like updateModelProperties(), but not run within a transaction. 
+  """
+  properties = model.properties()
+
+  for prop in properties.values():
+    if prop.name in model_properties:
+      value = model_properties[prop.name]
+      prop.__set__(model, value)
+
+  model.put()
+  return model
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