I am trying to wrap up my first app using Django (specifically Django Rest
Framework which may change the save behavior), but have run into an issue
that I haven't been able to solve for about 10 hours now.
I am trying to override the save() method of a model to modify a field on a
bunch of child objects when it is created; however, I can't figure out *any*
way
get the objects or ids for the children.
My code looks something like:
class Parent(models.Model):
"""When I create this, I want the children to be modified."""
def save(self, *args, **kwargs):
if not self.pk:
self._begin(*args, **kwargs)
else:
super(Parent, self).save(*args, **kwargs)
def _begin(self, *args, **kwargs):
super(Parent, self).save(*args, **kwargs)
print(self.child_set.all()) # --> This gives: "<QuerySet []>"
for i in self.child_set.all():
i.last_name = self.last_name
i.save()
last_name = models.CharField(max_length=100)
class Child:
parent = models.ForeignKey(
'Parent',
on_delete=models.SET_NULL,
null=True,
)
last_name = models.CharField(max_length=100)
ANY way to modify the children when the parent is saved would be a life
saver (even if hacky or sub-optimal).
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