with - django update foreign key
Django ForeignKey Instance vs Raw ID (1)
Is there a way to not have to pass in a model instance for a foreign key when create a new model? Let's say I have the following models:
class Foo(models.Model): description = models.CharField(max_length=100) class Meta: db_table = u'foo' class Bar(models.Model): info = models.CharField(max_length=100) foo = models.ForeignKey('Foo') class Meta: db_table = u'bar'
The later a post request comes in to a view - I know the the id of a foo record and just want to insert a record into the bar table.
if I do:
new_bar = Bar(info="something important", foo=foo_id) new_bar.save()
I get a ValueError saying "Cannot assign "546456487466L": "Bar.foo" just be a "Foo" instance.
So, I get it... it wants me to have an actual instance of the Foo model. I understand that I can just do a get on Foo and then pass it in. But, there seems like there must be a way to override this functionality. I have done some googling and reading the docs, and raw_id_fields in admin seems to be the basic idea. (which is to say, allow a raw id here). But, don't see this option on the ForeignKey field.
It seems very inefficient to have to make a round trip to the database to get an object to get the id (which I already have). I understand that doing the round trip validates that the id exists in the database. But, hey... that's why I'm using a RDBMS and have foreign keys in the first place.