title: MongoDB DBRef ON DELETE CASCADE
body: <p>Is there a way in MongoDB to have a foreign key with a 'ON DELETE CASCADE' functionality?</p>
  
  <p>I know you can use DBRef as a sort of foreign key but when the item in a collection where the reference points to is removed, the reference returns null. But i want that the item where the reference belongs to gets removed. How do i do this?</p>
  
  <p>Or do i need every time i remove things check references to it?</p>