fortunately my case was really simple, i had to count number of m2m objects
attached to my model and storing it as field, and had to make the decision
of having a ForeignKey/OneToOne relation based on number of m2m objects
attached.I was already using m2m_changed signal ( on post_add ), so i
handled the case there itself
thanks tran.
:)
On Thursday, February 7, 2013 2:33:46 PM UTC+5:30, Huu Da Tran wrote:
>
> You could overwrite the save() method... or if you are populating from a
> form, overwrite the clean() method.
>
> On Thursday, February 7, 2013 3:23:54 AM UTC-5, vijay shanker wrote:
>>
>> Hi
>> I have these two models Cart and CartItem,
>>
>> 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)
>> applied_rule =
>> models.OneToOneField(CartRule,null=True,blank=True)
>>
>>
>> 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)
>> def __str__(self):
>> return self.cart_id
>>
>> the rules to be applied only when there are more than two items in
>> shoppingcart, i.e i am looking for a way to attach a rule to cart only if
>> there are more than two items in cart (cartitems m2m field should have more
>> than two objects in it).
>> How should i go about it ?
>>
>
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