About on_delete Values for Foreign Keys
A rule of thumb to set the on_delete for foreign keys and one-to-one relationships is as follows:
- If the field can be blank and null, set
on_delete=models.SET_NULL. - If there the field has a default value, set
on_delete=models.SET_DEFAULT. - Otherwise, set
on_delete=models.CASCADE.
Note that CASCADE deletes all children automatically if the parent is deleted.
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