Allow a limit_choices_to callable to accept the current model instances object

[Ochui Princewill]

Hello, 

Am current working on a project and i want to filter the content of a ForeignkeyField base on the current model object

class Subscription(models.Model):

user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)

plan = models.ForeignKey(Plan, on_delete=models.CASCADE)

expires = models.DateField()

created_at = models.DateTimeField(auto_now_add=True)

class Profile(models.Model):

user = models.OneToOneField(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, editable=False)

subscription = models.ForeignKey(Subscription, limit_choices_to={'user_id': settings.AUTH_USER_MODEL}, on_delete=models.SET_NULL, null=True, blank=True)

[Tim Graham]

There's a ticket with that feature request: https://code.djangoproject.com/ticket/25306