Let the auth handler manage user merge

tailbone/views/users.py

@@ -52,6 +52,7 @@ class UserView(PrincipalMasterView):
     model_row_class = UserEvent
     has_versions = True
     touchable = True
+    mergeable = True
 
     grid_columns = [
         'username',
@@ -78,23 +79,13 @@ class UserView(PrincipalMasterView):
         'occurred',
     ]
 
-    mergeable = True
-    merge_additive_fields = [
-        'sent_message_count',
-        'received_message_count',
-    ]
-    merge_coalesce_fields = [
-        'person_uuid',
-        'person_name',
-        'active',
-    ]
-    merge_fields = merge_additive_fields + [
-        'uuid',
-        'username',
-        'person_uuid',
-        'person_name',
-        'role_count',
-    ]
+    def __init__(self, request):
+        super(UserView, self).__init__(request)
+        app = self.get_rattail_app()
+
+        # always get a reference to the auth/merge handler
+        self.auth_handler = app.get_auth_handler()
+        self.merge_handler = self.auth_handler
 
     def query(self, session):
         query = super(UserView, self).query(session)
@@ -441,31 +432,6 @@ class UserView(PrincipalMasterView):
                 users.append(user)
         return users
 
-    def get_merge_data(self, user):
-        return {
-            'uuid': user.uuid,
-            'username': user.username,
-            'person_uuid': user.person_uuid,
-            'person_name': user.person.display_name if user.person else None,
-            '_roles': user.roles,
-            'role_count': len(user.roles),
-            'active': user.active,
-            'sent_message_count': len(user.sent_messages),
-            'received_message_count': len(user._messages),
-        }
-
-    def get_merge_resulting_data(self, remove, keep):
-        result = super(UserView, self).get_merge_resulting_data(remove, keep)
-        result['role_count'] = len(set(remove['_roles'] + keep['_roles']))
-        return result
-
-    def merge_objects(self, removing, keeping):
-        # TODO: merge roles, messages
-        assert not removing.sent_messages
-        assert not removing._messages
-        assert not removing._roles
-        self.Session.delete(removing)
-
     def preferences(self, user=None):
         """
         View to modify preferences for a particular user.