Working with Django post_save () post

Question

I have two tables:

class Advertisement(models.Model): created_at = models.DateTimeField(auto_now_add=True) author_email = models.EmailField() class Verification(models.Model): advertisement = models.ForeignKeyField(Advertisement) key = models.CharField(max_length=32) 

And I need to automatically populate the Verification table after adding a new ad.

 def gen_key(sender, instance, created, **kwargs): if created: from hashlib import md5 vkey = md5("%s%s" % (instance.author_email, instance.created_at)) ver = Verification(advertisement=instance) ver.key = vkey ver.save() post_save.connect(gen_key, sender=Advertisement) 

Of course, this will not work. Django 1.2 Q: How do I do this?

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Okay, half allowed.
The problem is that post_save () for the parent model does not call child models.
This way you can solve this problem by providing the child class directly.

 class Advertisement(models.Model): created_at = models.DateTimeField(auto_now_add=True) author_email = models.EmailField() class Sale(Advertisement): rooms = models.IntegerField(max_length=1) subway = models.ForeignKey(Subway) class Verification(models.Model): advertisement = models.ForeignKeyField(Advertisement) key = models.CharField(max_length=32) def gen_key(sender, instance, created, **kwargs): code goes here post_save.connect(gen_key, sender=Sale, dispatch_uid="my_unique_identifier") 

So the next question: "How can I use the parent class for post_save ()?"

Answer 1

instead of connecting to a specific sender, just connect to post_save as a whole and check the class of the stored instance in your handler, for example

 def gen_key(sender, **kwargs): if issubclass(sender, Advertisement): code goes here post_save.connect(gen_key, dispatch_uid="my_unique_identifier")