Don't know if this is the solution for you, but you could take a look
here: http://docs.djangoproject.com/en/dev/ref/contrib/contenttypes/#id1
and do something like this:
class Product(models.Model):
name = models.CharField(max_length=64)
class Meta:
abstract = True
class SubProduct1(Product):
prop1 = models.FloatField()
class SubProduct2(Product):
prop1 = models.EmailField()
class OrderProduct(models.Model):
order = models.ForeignKey(Order)
content_type = models.ForeignKey(ContentType)
object_id = models.PositiveIntegerField()
product = generic.GenericForeignKey()
Good luck!
On Tue, 2009-09-22 at 18:56 +0300, Jani Tiainen wrote:
> model.py:
>
> from django.db import models
>
> class Order(models.Model):
> name = models.CharField(max_length=64)
>
> def __unicode__(self):
> return self.name
>
> class Product(models.Model):
> name = models.CharField(max_length=64)
>
> def __unicode__(self):
> return self.name
>
> class SubProduct1(Product):
> prop1 = models.FloatField()
>
> def __unicode__(self):
> return self.name
>
> class SubProduct2(Product):
> prop2 = models.EmailField()
>
> def __unicode__(self):
> return self.name
>
> class OrderProduct(models.Model):
> order = models.ForeignKey(Order)
> product = models.ForeignKey(Product)
>
> amount = models.IntegerField()
>
> def __unicode__(self):
> return u'%s - %s - %s' % (self.order.name, self.product.name,
> self.amount)
>
>
> Now it's trivial play with sub products and add spesific subproducts to
> orderproduct.
>
> But, then, how to list all SubProducts that belongs to spesific order?
>
> Specially thing stops at "Product", it doesn't know which one of those
> two subproducts it actually is.
>
> I did following quick hack to get around this problem (added this to
> Product model):
>
> def _get_subproduct(self):
> for attr in ['subproduct1', 'subproduct2', ]:
> try:
> return getattr(self, attr)
> except ObjectDoesNotExist:
> pass
>
> subproduct = property(_get_subproduct)
>
>
> This just don't feel optimal solution, specially it hits database for
> every subitem tried.
>
> Any better way to achieve same without hitting that much database?
>
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