Re: Help with some models inheritance and the use of default

[V]

On May 6, 3:56 pm, Felix  wrote:
> I have the next models:
>
> class Place(models.Model):
>     currency = models.CharField(_('currency'), max_length=128,
> blank=True, null=True)
>     language = models.CharField(_('official language'),
> max_length=128, blank=True, null=True)
>     class Meta:
>        abstract= True
>
> class Country(Place):
>     country = models.CharField(_('country'), max_length = 100)
>     continent = models.CharField(_('continent'),
> choices=CONTINENT_CHOICES, max_length = 2, blank = True, null=True)
>     president = models.CharField(_('president'), max_length = 100,
> blank = True, null=True)
>
> class City(Place):
>     city = models.CharField(_('city'), max_length=100)
>     country = models.ForeignKey(Country)
>     language = ??
>
> How can I set language of the to the language of its country's
> language by default?
> Thanks for reading

why won't you use non-abstract inheritance? that way all your cities
would inherit all the properties of the respective country instance,
language including

V
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Re: Help with some models inheritance and the use of default

[George Song]

On 5/6/2009 6:56 AM, Felix wrote:
> I have the next models:
> 
> class Place(models.Model):
> currency = models.CharField(_('currency'), max_length=128,
> blank=True, null=True)
> language = models.CharField(_('official language'),
> max_length=128, blank=True, null=True)
> class Meta:
> abstract = True
> 
> class Country(Place):
> country = models.CharField(_('country'), max_length = 100)
> continent = models.CharField(_('continent'),
> choices=CONTINENT_CHOICES, max_length = 2, blank = True, null=True)
> president = models.CharField(_('president'), max_length = 100,
> blank = True, null=True)
> 
> class City(Place):
> city = models.CharField(_('city'), max_length=100)
> country = models.ForeignKey(Country)
> language = ??
> 
> How can I set language of the to the language of its country's
> language by default?

I think the easiest thing is to put the logic in your `City.save()` 
method, since you'll have access to the instance's country at that 
point. Then it's just a matter of looking up the country to language 
mapping somewhere.

-- 
George

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