diff -r c76a366c7ab4 -r a1cc853a56e5 app/soc/logic/__init__.py
--- a/app/soc/logic/__init__.py	Sun Oct 12 00:08:54 2008 +0000
+++ b/app/soc/logic/__init__.py	Sun Oct 12 00:12:53 2008 +0000
@@ -0,0 +1,119 @@
+#!/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.
+
+"""Various (Model) query functions.
+"""
+
+__authors__ = [
+  '"Sverre Rabbelier" <sverer@rabbelier.nl>',
+  ]
+
+
+import key_name
+import model
+import soc.models.document
+import soc.models.sponsor
+import soc.models.work
+import soc.models.site_settings
+
+
+class DocumentLogic(model.BaseLogic):
+  """Logic methods for the Document model
+  """
+
+  def __init__(self):
+    """Defines the name, key_name and model for this entity.
+    """
+
+    self._name = "document"
+    self._model = soc.models.document.Document
+    self._keyName = key_name.nameDocument
+    self._skip_properties = []
+
+
+class SettingsLogic(model.BaseLogic):
+  """Logic methods for the Settings model
+  """
+
+
+  def __init__(self):
+    """Defines the name, key_name and model for this entity.
+    """
+
+    self._name = "settings"
+    self._model = soc.models.site_settings.SiteSettings
+    self._keyName = key_name.nameSiteSettings
+    self._skip_properties = []
+
+
+class SponsorLogic(model.BaseLogic):
+  """Logic methods for the Sponsor model
+  """
+
+  def __init__(self):
+    """Defines the name, key_name and model for this entity.
+    """
+
+    self._name = "sponsor"
+    self._model = soc.models.sponsor.Sponsor
+    self._keyName = key_name.nameSponsor
+    self._skip_properties = []
+
+
+class UserLogic(model.BaseLogic):
+  """Logic methods for the User model
+  """
+
+  def __init__(self):
+    """Defines the name, key_name and model for this entity.
+    """
+
+    self._name = "user"
+    self._model = soc.models.user.User
+    self._keyName = key_name.nameUser
+    self._skip_properties = ['former_ids']
+
+  def _updateField(self, model, name, value):
+    """Special case logic for id.
+
+    When the id is changed, the former_ids field should be appended
+    with the old id.
+    """
+    if name == 'id' and model.id != value:
+      model.former_ids.append(model.id)
+
+    return True
+
+class WorkLogic(model.BaseLogic):
+  """Logic methods for the Work model
+  """
+
+  def __init__(self):
+    """Defines the name, key_name and model for this entity.
+    """
+
+    self._name = "work"
+    self._model = soc.models.work.Work
+    self._keyName = key_name.nameWork
+    self._skip_properties = []
+    # TODO(tlarsen) write a nameWork method
+
+
+document_logic = DocumentLogic()
+settings_logic = SettingsLogic()
+sponsor_logic = SponsorLogic()
+user_logic = UserLogic()
+work_logic = WorkLogic()