konova/models/object.py

@@ -501,10 +501,13 @@ class ShareableObjectMixin(models.Model):
         Returns:
 
         """
-        directly_shared = self.shared_users.filter(id=user.id).exists()
-        team_shared = self.shared_teams.filter(
-            users__in=[user]
-        ).exists()
+        obj_shared_teams = self.shared_teams
+        obj_shared_users = self.shared_users
+        user_shared_teams = user.shared_teams
+
+        directly_shared = obj_shared_users.filter(id=user.id).exists()
+        team_shared = (obj_shared_teams & user_shared_teams).exists()
+
         is_shared = directly_shared or team_shared
         return is_shared