I would use signals for that purpose
On 11-02-11 10:18, bagheera wrote:
Hi, i would like to perform validation on m2m field to control, if
user made any changes. I'd like to disallow removing relations from
m2m field, only adding them.
example:
model Product(models.Model):
name = models.TextField()
model Order(models.Model):
products = models.ManyToManyField(Product)
If user creates an order with three products, he can't remove any
product from order after object has been saved.
Is there any way to do that on model level?
if i put in clean() method:
current_products = self.products.all() i will get list of products
currently assigned to order. Can i get list of objects that was chosen
in form, so i could compare them and raise validation error if needed?
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