There are short docs here:
http://www.djangoproject.com/documentation/model-api/#overriding-default-model-methods
That's really all you need to know. Just manipulate your fields and then
call the original save method (through super).
Another simple example. This save method emulates the behavior of
auto_now_add=True (which is going to be removed before 1.0):
class Organization(models.Model):
create_date = models.DateField()
def save(self):
"""Ensure we have a create_date before saving the first time."""
if not self.id:
self.create_date = datetime.date.today()
super(Organization, self).save()
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