POST with models & forms

A booking needs a walker

So far Walker has been the only model in playground/django-pawwalk/. But a booking doesn't exist on its own — it's always a booking of a specific walker. That's a relationship, and Django models relationships with a ForeignKey.

class Booking(models.Model):
    walker = models.ForeignKey("Walker", on_delete=models.CASCADE)
    duration_minutes = models.IntegerField()
    price_cents = models.IntegerField()

Read on_delete=models.CASCADE as an instruction, not decoration: if this walker is deleted, delete their bookings too. Every ForeignKey in Django must say what happens on the other side when the parent row disappears — there's no silent orphaning.