Can delete all the notifications of a given user

src/helpers/notifications_helper.rs

@@ -21,6 +21,11 @@ pub fn delete(notification: &PartialNotification) -> ResultBoxError {
         .exec()
 }
 
+/// Delete all the notifications of a given user
+pub fn delete_all_user(user_id: &UserID) -> ResultBoxError {
+    delete(&PartialNotification::new().set_dest_user_id(user_id))
+}
+
 /// Check out whether a similar notification exists for given specifications
 pub fn similar_exists(n: &PartialNotification) -> ResultBoxError<bool> {
     database::QueryInfo::new(NOTIFICATIONS_TABLE)