diff -r c31cfbf1a20f -r 9045b8888772 app/soc/logic/models/group.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/app/soc/logic/models/group.py	Fri Nov 21 11:44:39 2008 +0000
@@ -0,0 +1,92 @@
+#!/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.
+
+"""Group (Model) query functions.
+"""
+
+__authors__ = [
+  '"Sverre Rabbelier" <sverre@rabbelier.nl>',
+  ]
+
+
+from soc.logic.models import base
+
+import soc.models.group
+
+
+class Logic(base.Logic):
+  """Logic methods for the Group model.
+  """
+
+  def __init__(self, model=soc.models.group.Group, base_model=None):
+    """Defines the name, key_name and model for this entity.
+    """
+    base.Logic.__init__(self, model, base_model=base_model)
+
+  def getKeyValues(self, entity):
+    """Extracts the key values from entity and returns them.
+
+    The default implementation for Groups assumes that the Group is site-wide
+    and thus has no scope.  Such Groups include Sponsors and Clubs.  Any
+    Group that exists per-Program or per-Year will need to override this
+    method.
+
+    Args:
+      entity: the entity from which to extract the key values
+    """
+
+    return [entity.link_id]
+
+  def getKeyValuesFromFields(self, fields):
+    """Extracts the key values from a dict and returns them.
+
+    The default implementation for Groups assumes that the Group is site-wide
+    and thus has no scope.  Such Groups include Sponsors and Clubs.  Any
+    Group that exists per-Program or per-Year will need to override this
+    method.
+
+    Args:
+      fields: the dict from which to extract the key values
+    """
+
+    return [fields['link_id']]
+
+  def getKeyFieldNames(self):
+    """Returns an array with the names of the Key Fields.
+
+    The default implementation for Groups assumes that the Group is site-wide
+    and thus has no scope.  Such Groups include Sponsors and Clubs.  Any
+    Group that exists per-Program or per-Year will need to override this
+    method.
+    """
+
+    return ['link_id']
+
+
+  def isDeletable(self, entity):
+    """Returns whether the specified Group entity can be deleted.
+
+    Generically, a Group can always be deleted.  Subclasses of group.Logic
+    should add their own deletion prerequisites.
+    
+    Args:
+      entity: an existing Group entity in the Datastore
+    """
+
+    return True
+
+
+logic = Logic()