Create OptimisticResponseTypeMixin

aleksis/core/schema/base.py

@@ -77,6 +77,16 @@ class PermissionsTypeMixin:
         return info.context.user.has_perm(perm, root)
 
 
+class OptimisticResponseTypeMixin:
+    """Mixin for using OptimisticResponse in the frontend.
+
+    Simply adds a field called `is_optimistic` that is always false,
+    but should be set to true by the frontend
+    """
+
+    is_optimistic = graphene.Boolean(default=False)
+
+
 class PermissionBatchPatchMixin:
     class Meta:
         login_required = True