diff --git a/rhodecode/model/users_group.py b/rhodecode/model/users_group.py
new file mode 100644
--- /dev/null
+++ b/rhodecode/model/users_group.py
@@ -0,0 +1,89 @@
+# -*- coding: utf-8 -*-
+"""
+    rhodecode.model.users_group
+    ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+    users group model for RhodeCode
+
+    :created_on: Oct 1, 2011
+    :author: nvinot
+    :copyright: (C) 2011-2011 Nicolas Vinot <aeris@imirhil.fr>
+    :license: GPLv3, see COPYING for more details.
+"""
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import logging
+import traceback
+
+from rhodecode.model import BaseModel
+from rhodecode.model.caching_query import FromCache
+from rhodecode.model.db import UsersGroupMember, UsersGroup
+
+log = logging.getLogger( __name__ )
+
+class UsersGroupModel( BaseModel ):
+
+    def get( self, users_group_id, cache = False ):
+        users_group = UsersGroup.query()
+        if cache:
+            users_group = users_group.options( FromCache( "sql_cache_short",
+                                          "get_users_group_%s" % users_group_id ) )
+        return users_group.get( users_group_id )
+
+    def get_by_name( self, name, cache = False, case_insensitive = False ):
+        users_group = UsersGroup.query()
+        if case_insensitive:
+            users_group = users_group.filter( UsersGroup.users_group_name.ilike( name ) )
+        else:
+            users_group = users_group.filter( UsersGroup.users_group_name == name )
+        if cache:
+            users_group = users_group.options( FromCache( "sql_cache_short",
+                                          "get_users_group_%s" % name ) )
+        return users_group.scalar()
+
+    def create( self, form_data ):
+        try:
+            new_users_group = UsersGroup()
+            for k, v in form_data.items():
+                setattr( new_users_group, k, v )
+
+            self.sa.add( new_users_group )
+            self.sa.commit()
+            return new_users_group
+        except:
+            log.error( traceback.format_exc() )
+            self.sa.rollback()
+            raise
+
+    def add_user_to_group( self, users_group, user ):
+        for m in users_group.members:
+            u = m.user
+            if u.user_id == user.user_id:
+                return m
+
+        try:
+            users_group_member = UsersGroupMember()
+            users_group_member.user = user
+            users_group_member.users_group = users_group
+
+            users_group.members.append( users_group_member )
+            user.group_member.append( users_group_member )
+
+            self.sa.add( users_group_member )
+            self.sa.commit()
+            return users_group_member
+        except:
+            log.error( traceback.format_exc() )
+            self.sa.rollback()
+            raise