On Feb 5, 3:59 pm, knight <alexar...@gmail.com> wrote:
> Hi,
>
> I have the following classes in my models.py:
>
> class Default(models.Model):
> name = models.CharField(max_length=50, choices =
> (('rental_period', 'rental_period'), ('currency', 'currency')),
> unique=True)
> value = models.CharField(max_length=50)
>
> class Media_biz(models.Model):
> name = models.CharField(max_length=50)
> currency = models.ForeignKey(Currency)
> rental_period = models.CharField(max_length=5, blank=True,
> null=True)
>
> What I want is:
> When I add new Media_biz in my admin page, I want to check if there is
> a Default object with the name "currency" or "rental_period" and take
> it's value as default.
>
> I tried to use "default" field option for this, but I can't insert
> logic that checks Default objects in models.py, because it fails on
> syncdb if my db is empty.
>
> Does anybody have a solution how can I do that?
>
> Thanks,
> Arshavski Alexander.
You can override the save method in the Media_biz model to do this
check before saving.
def save(self, force_insert=False, force_update=False):
if not self.rental_period:
try:
default = Default.objects.get(name='rental_period')
except Default.DoesNotExist:
pass
else:
self.rental_period = default.value
# and something for currency - but see below
super(Media_biz, self).save(force_insert, force_update)
There's a piece of information missing before you can do the same with
currency, though. Currency is a foreign key, so what are you storing
in the Default model against 'currency'? Is it the value of a field on
the currency table?
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