Hi
I am using django version 1.4.3
I am using two signals in my models.py
one is m2m_changed, so i can have a counter field (numcounter) of number of
m2m fields attached, and another is post_save so i can decide whether to
have a OneToOneField (cartrule, is to be applied only if there are more
than 2 fields) or not.
my models.py is:
class CartItem(models.Model):
content_type = models.ForeignKey(ContentType)
object_id = models.PositiveIntegerField()
content_object = generic.GenericForeignKey('content_type','object_id')
quantity = models.PositiveIntegerField(default=0)
is_abandoned = models.BooleanField(default=False)
created_at = models.DateTimeField(auto_now_add=True)
update_at = models.DateTimeField(auto_now=True)
def __str__(self):
return self.content_object.name
class CartRule(models.Model):
##some field
pass
class Cart(models.Model):
cart_id = models.CharField(max_length=50, null=False)
customer = models.ForeignKey(Customer,null=True,blank=True)
cartitems = models.ManyToManyField(CartItem,null=True)
created_at = models.DateTimeField(auto_now_add=True)
update_at = models.DateTimeField(auto_now=True)
cartrule =
models.OneToOneField(crapclass,null=True,blank=True)
num_cartitem = models.IntegerField()
def __str__(self):
return self.cart_id
@receiver(post_save, sender=Cart)
def apply_condition(sender,instance,created,raw,using,*args,**kwargs):
# i want to decide here if num_cartitem is greater than 2 its ok to
have a cartrule
pass
@receiver(m2m_changed)
def save_cartitem_counter(sender, instance, signal,*args, **kwargs):
if kwargs['action'] == 'post_add':
instance.num_cartitem = instance.cartitems.all().count()
instance.save()
the issue is apply_condition gets called twice, with similar value of args,
first with older value of m2m (cartitem) field in Cart.
I looked into older post but still could not figure out the whys.
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