Question

Here’s my code:

class Publisher(models.Model):     name = models.CharField(             max_length = 200,             unique = True,     )      url = models.URLField()      def __unicode__(self):         return self.name      def save(self):         pass  class Item(models.Model):     publisher = models.ForeignKey(Publisher)      name = models.CharField(             max_length = 200,     )      code = models.CharField(             max_length = 10,     )      def __unicode__(self):         return self.name 

I want to be able to access each Item from the Publisher save function. How can I do this?

For instance, I’d like to append text to the code field of each Item associated with this Publisher on the save of Publisher.

edit: When I try to implement the first solution, I get the error ”Publisher’ object has no attribute ‘item_set”. Apparently I can’t access it that way. Any other clues?

edit 2: I discovered that the problem occurring is that when I create a new Publisher object, I add Items inline. Therefor, when trying to save a Publisher and access the Items, they don’t exist.

Is there any way around this?!

Answer 1

You should be able to do something like the following:

def save(self, **kwargs):     super(Publisher, self).save(**kwargs)      for item in self.item_set.all():         item.code = '%s - whatever' % item.code 

I don’t really like what you’re doing here, this isn’t a good way to relate Item to Publisher. What is it you’re after in the end?