[CORD-3084] Attaching a subscriber to an ONU

Change-Id: Id73c2ba3238b51615e541139b0e7ad0de30a0ba5
diff --git a/xos/synchronizer/models/models.py b/xos/synchronizer/models/models.py
new file mode 100644
index 0000000..eeb5e74
--- /dev/null
+++ b/xos/synchronizer/models/models.py
@@ -0,0 +1,54 @@
+# Copyright 2017-present Open Networking Foundation
+#
+# 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.
+
+from core.models.xosbase import *
+
+from models_decl import VOLTService_decl
+from models_decl import VOLTServiceInstance_decl
+from models_decl import OLTDevice_decl
+from models_decl import PONPort_decl
+from models_decl import ONUDevice_decl
+
+class VOLTService(VOLTService_decl):
+    class Meta:
+        proxy = True
+
+    @staticmethod
+    def has_access_device(serial_number):
+        try:
+            ONUDevice.objects.get(serial_number=serial_number)
+            return True
+        except IndexError, e:
+            return False
+
+
+class VOLTServiceInstance(VOLTServiceInstance_decl):
+    class Meta:
+        proxy = True 
+
+
+class OLTDevice(OLTDevice_decl):
+    class Meta:
+        proxy = True 
+
+
+class PONPort(PONPort_decl):
+    class Meta:
+        proxy = True 
+
+
+class ONUDevice(ONUDevice_decl):
+    class Meta:
+        proxy = True 
+