diff --git a/planetstack/model_policies/model_policy_Controller.py b/planetstack/model_policies/model_policy_Controller.py
new file mode 100644
index 0000000..9415bb5
--- /dev/null
+++ b/planetstack/model_policies/model_policy_Controller.py
@@ -0,0 +1,41 @@
+
+def handle(controller):
+    from core.models import Controller, Site, ControllerSite, Slice, ControllerSlice, User, ControllerUser
+    from collections import defaultdict
+    # relations for all sites
+    ctrls_by_site = defaultdict(list)
+    ctrl_sites = ControllerSite.objects.all()
+    for ctrl_site in ctrl_sites:
+        ctrls_by_site[ctrl_site.site].append(ctrl_site.controller)
+    sites = Site.objects.all()
+    for site in sites:
+        if site not in ctrls_by_site or \
+            controller not in ctrls_by_site[site]:
+            controller_site = ControllerSite(controller=controller, site=site)
+            controller_site.save()	
+    # relations for all slices
+    ctrls_by_slice = defaultdict(list)
+    ctrl_slices = ControllerSlice.objects.all()
+    for ctrl_slice in ctrl_slices:
+        ctrls_by_slice[ctrl_slice.slice].append(ctrl_slice.controller)
+    slices = Slice.objects.all()
+    for slice in slices:
+        if slice not in ctrls_by_slice or \
+            controller not in ctrls_by_slice:
+            controller_slice = ControllerSlice(controller=controller, slice=slice)
+            controller_slice.save()    
+    # relations for all users
+    ctrls_by_user = defaultdict(list)
+    ctrl_users = ControllerUser.objects.all()
+    for ctrl_user in ctrl_users:
+        ctrls_by_user[ctrl_user.user].append(ctrl_user.controller)
+    users = User.objects.all()
+    for user in users:
+        if user not in ctrls_by_user or \
+            controller not in ctrls_by_user[user]:
+            controller_user = ControllerUser(controller=controller, user=user)
+            controller_user.save()         
+
+
+
+