well .. odd .. replying my own post ..
kwargs['action']
A string indicating the type of update that is done on the relation. This
can be one of the following:
"pre_add"Sent *before* one or more objects are added to the relation.
"post_add"Sent *after* one or more objects are added to the relation.
"pre_remove"Sent *before* one or more objects are removed from the relation.
"post_remove"Sent *after* one or more objects are removed from the relation.
"pre_clear"Sent *before* the relation is cleared."post_clear"Sent *after*the
relation is cleared.
m2m_changed calls the handle_something function with different
kwargs['action'] value which can help you differentiate between them.
On Friday, June 8, 2012 7:24:34 PM UTC+5:30, vijay shanker wrote:
>
> hi
> i have this model Client_Order
> i want to do some manipulation each time a new pakg is added to this
> field.
> i used m2m_changed signal, but it cant distinguish between existing
> instances attached and the newly added ones.
> both post_add and pre_add show the same number of instances .. i.e if
> a.b were attached and i added c instance to it .. both post_add and
> pre_add give the same pk_set in kwargs
>
> ACTV_STATUS = (
> ('Active','Active'),
> ('Inactive','Inactive'),
> )
>
> class Client_Order(models.Model):
> order_name = models.CharField(max_length=300)
> order_desc = models.TextField(verbose_name="Order
> Description")
> order_client = models.ForeignKey(Client_sda)
> order_active_status = models.CharField(choices = ACTV_STATUS,
> max_length=300)
> order_pakages = models.ManyToManyField(Pakage,
> help_text="Please attach a maximum of 5 packages only. ")
> discount = models.IntegerField(default=0)
> total_amount = models.IntegerField()
> order_booking_date = models.DateField()
> order_expiry_date = models.DateField()
>
> @receiver(m2m_changed)
> def handle_something(sender, instance, signal,*args, **kwargs):
> print kwargs
> print 'pk_set->',kwargs['pk_set']
>
> how do i distinguish between newly added instances from previously
> added ones ?
>
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