Add permission post init to initialize signal handler and registry file

apps/permissions/post_init.py

@@ -0,0 +1,26 @@
+from __future__ import absolute_import
+
+from django.contrib.auth.models import User
+from django.db.models.signals import post_save
+from django.core.exceptions import ObjectDoesNotExist
+
+
+def user_post_save(sender, instance, **kwargs):
+    from .settings import DEFAULT_ROLES
+
+    if kwargs.get('created', False):
+        for default_role in SETTING_DEFAULT_ROLES:
+            if isinstance(default_role, Role):
+                #If a model is passed, execute method
+                default_role.add_member(instance)
+            else:
+                #If a role name is passed, lookup the corresponding model
+                try:
+                    role = Role.objects.get(name=default_role)
+                    role.add_member(instance)
+                except ObjectDoesNotExist:
+                    pass
+
+
+def init_signal_handler():
+    post_save.connect(user_post_save, sender=User)