[PYTHON] Override save method in django-models

Overwrite Model's save method if you want something to be done just before inserting into the database

class Event(models.Model):

    class Meta:
        unique_together = ('name', 'held_date')

    id = models.CharField(primary_key=True, max_length=20)
    name = models.CharField(max_length=8)
    held_date = models.DateField()

    def save(self, **kwargs):
        u"""Create the value of the primary key just before inserting"""
        self.id = "%s@%s" % (str(self.held_date), self.name)
        super(Event, self).save(**kwargs)

When I overwrite django's save (), the manager's method may or may not call it.

Call me

• create
• get_or_create
• update_or_create

Don't call me

• bulk_create
  • This does *not* call save() on each of the instances

It's surprisingly called. There is also signals.pre_save, but it's the same as doing it, and save overwriting is more explicit.