Handle adding and removing relations from Roles.

This adds addRelation and removeRelation capabilities to Role, making it possible to add users to the users column and roles to the roles column in a Role object, for example. This prevents the error of Role not having the attribute addRelation or removeRelation when trying to add users or roles to a Role, which is critical for Role functionality.

parse_rest/role.py

@@ -30,6 +30,28 @@ class Role(ParseResource):
 
     def __repr__(self):
         return '<Role:%s (Id %s)>' % (getattr(self, 'name', None), self.objectId)
+    
+    def removeRelation(self, key, className, objectsId):
+        self.manageRelation('RemoveRelation', key, className, objectsId)
+
+    def addRelation(self, key, className, objectsId):
+        self.manageRelation('AddRelation', key, className, objectsId)
+
+    def manageRelation(self, action, key, className, objectsId):
+        objects = [{
+                    "__type": "Pointer",
+                    "className": className,
+                    "objectId": objectId
+                    } for objectId in objectsId]
+
+        payload = {
+            key: {
+                 "__op": action,
+                 "objects": objects
+                }
+            }
+        self.__class__.PUT(self._absolute_url, **payload)
+        self.__dict__[key] = ''
 
 
 Role.Query = QueryManager(Role)