django create secondary model on create

When working in Django if you have related models that require an on-create feature to generate a child you can utilize the post_save callbacks.

This is especially useful when we want to generate the secondary model using information largely irrelevant to the parent model.

One instance would be a User model parent that has a child model holding its state. This state could be a Profile of additional information, some sort of Organization model that has account payment status, etc.

By generating this on User create we would be able to have a secondary representation of the User without having to do any complex callbacks/checks to ensure they have this data representation.

Ideally, we would be creating this child model with some default values.

@receiver(post_save, sender=User)
def create_your_model(sender, instance, created, **kwargs):
    if created:
        SomeModel.objects.create(your_foreign_key_field=instance)


@receiver(post_save, sender=User)
def save_your_model(sender, instance, **kwargs):
    instance.somemodel.save()