django foreign key field on delete do nothing

  1. In Django, when defining a foreign key field, you can specify the on_delete behavior to define what happens when the referenced object is deleted.
  2. The on_delete behavior can be set to models.DO_NOTHING to indicate that nothing should happen when the referenced object is deleted.
  3. When on_delete=models.DO_NOTHING is specified, if the referenced object is deleted, the related foreign key field will still retain the value of the deleted object's primary key.
  4. This means that the related object will still point to the deleted object, even though the referenced object no longer exists in the database.
  5. It's important to consider the implications of using on_delete=models.DO_NOTHING, as it can lead to referential integrity issues if not handled carefully.
  6. Additionally, it's crucial to ensure that the application logic can handle cases where the related object no longer exists in the database when using models.DO_NOTHING.