#25672: Related ManyToMany fields with custom intermediary model should not
disable
remove method.
-------------------------------------+-------------------------------------
Reporter: Antwan86 | Owner: nobody
Type: | Status: new
Cleanup/optimization |
Component: Database layer | Version: 1.8
(models, ORM) |
Severity: Normal | Resolution:
Keywords: manytomany related | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Comment (by bmispelon):
I had a chat with Russ and he raised the following point. Consider a
custome through table that (unlike the auto-generated one) doesn't enforce
unicity on the `(model1, model2)` pair (which is a valid usecase).
Something like this:
{{{#!python
class Pizza(models.Model):
name = models.CharField(max_length=50)
class Customer(models.Model):
name = models.CharField(max_length=50)
orders = models.ManyToManyField('Pizza', through='Order')
class Order(models.Model):
pizza = models.ForeignKey('Pizza')
customer = models.ForeignKey('Customer')
ordered_on = models.DateTimeField(default=timezone.now)
}}}
Doing `some_customer.orders.remove(some_pizza)` doesn't give enough
information as to which `Order` instance should actually be deleted.
It seems to me that we should just better document the reason behind this,
considering it's not exactly obvious.
--
Ticket URL: <https://code.djangoproject.com/ticket/25672#comment:2>
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