Hi all -
I have two models with a many-to-many relationship: Restaurant and
Cuisine. The Cuisine table contains, e.g., "Italian", "Mexican",
"Chinese", etc. Each Restaurant record can be associated with one or
more Cuisines.
Here's the thing: I'd like to limit this to three Cuisines per
Restaurant. So when editing the record for "Bob's Pan-Asian Buffet",
the user would be able to check "Japanese", "Chinese", and "Korean",
but wouldn't be able to check a fourth box.
My question: can this be enforced within the model, or is this
something I'd have to build into my interface layer?
Here's my models.py.
from django.db import models
from django.contrib.auth.models import User
class Restaurant( models.Model ):
user = models.ForeignKey( User )
name = models.CharField( max_length = 128 )
slug = models.CharField( max_length = 24, unique = True )
cuisines = models.ManyToManyField( 'Cuisine' )
def __unicode__(self):
return self.name
class Cuisine( models.Model ):
name = models.CharField( max_length = 32 )
def __unicode__(self):
return self.name
class Meta:
ordering = ['name']
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