I'm trying to generate a slug for a model, based on the contents of
many2many field, but my approaches so far don't seem to work. I'd be
grateful if anyone point me towards a better approach. Here's a simple
example of what I'm doing:
class Item(models.Model):
name = models.CharField()
def __unicode__(self):
return self.name
class Ticket(models.Model)
items = models.ManyToManyField(Item)
slug = models.CharField(editable=False)
def update_ticket_slug(**kwargs):
instance = kwargs['instance']
# concatenate the names of all the items into a string
instance.slug = ", ".join([str(i) for i in instance.items.all()])
instance.save()
post_save.connect(update_ticket_slug, sender=Ticket)
The post_save signal is correctly fired, but instance.items.all()
always returns an empty set. I guess the m2m relation hasn't been
saved yet. Question: how do I do what I'm trying to do above? Is there
a different approach I can use?
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