diff --git a/xos/synchronizer/model_policies/model_policy_Site.py b/xos/synchronizer/model_policies/model_policy_Site.py
index f800092..07fe6f3 100644
--- a/xos/synchronizer/model_policies/model_policy_Site.py
+++ b/xos/synchronizer/model_policies/model_policy_Site.py
@@ -5,9 +5,10 @@
     # make sure site has a ControllerSite record for each controller
     ctrl_sites = ControllerSite.objects.filter(site_id=site.id)
     existing_controllers = [cs.controller for cs in ctrl_sites]
+    existing_controller_ids = [c.id for c in existing_controllers]
 
     all_controllers = Controller.objects.all()
     for ctrl in all_controllers:
-        if ctrl not in existing_controllers:
+        if ctrl.id not in existing_controller_ids:
             ctrl_site = ControllerSite(controller=ctrl, site=site)
             ctrl_site.save() 
diff --git a/xos/synchronizer/model_policies/model_policy_Slice.py b/xos/synchronizer/model_policies/model_policy_Slice.py
index 68aa596..dfc136a 100644
--- a/xos/synchronizer/model_policies/model_policy_Slice.py
+++ b/xos/synchronizer/model_policies/model_policy_Slice.py
@@ -85,10 +85,11 @@
         net_slices = [x for x in net_slices if x.network_id in public_net_ids+private_net_ids]
 
         for net_slice in net_slices:
-            if net_slice.network in public_nets:
+            if net_slice.network.id in public_nets_ids:
                 public_net_slice = net_slice
-            elif net_slice.network in private_nets:
+            elif net_slice.network.id in private_nets_ids:
                 private_net_slice = net_slice
+                
         if support_nat_net and (not public_net_slice):
             public_net_slice = NetworkSlice(slice=slice, network=public_nets[0])
             public_net_slice.save()