Given the following block of code:
--- models.py ---
from django.db import models
from django.db.models.signals import post_save
class Animal(models.Model):
category = models.CharField(max_length=20)
class Dog(Animal):
color = models.CharField(max_length=10)
def echo_category(sender, **kwargs):
print "category: '%s'" % sender.category
post_save.connect(echo_category, sender=Dog)
and the following fixture:
--- initial_data.json ---
[
{
"pk": 1,
"model": "animal.animal",
"fields": {
"category": "omnivore"
}
},
{
"pk": 1,
"model": "animal.dog",
"fields": {
"color": "brown"
}
}
]
Executing manage.py syncdb throws "AttributeError: type object 'Dog'
has no attribute 'category'" from inside of echo_category callback.
This is weird because I can access category from the Dog instance if
it is an instance from a query, say Dog.objects.get(pk=1).
How come the Dog instance received by echo_category is different
compared to the Dog instance from a query? Can't I do post_save on a
sub-model?
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