Hi
I am writing a web shop. I have a shopping cart class, which has a
many to many relationship to an item class, the item class has three
derived classes. The basic schema is shown below:
class Item(models.Model):
title = models.CharField(max_length=100)
description = models.CharField(max_length=500)
price = models.DecimalField(max_digits=7, decimal_places=2,
verbose_name=u'Price (£)')
class Bike(Item):
manufacturer = models.CharField(max_length=50)
class BikePart(Item):
partType = models.CharField(max_length=50, choices=PARTTYPE_CHOICES)
class Accessory(Item):
accessoryType = models.CharField(max_length=50,
choices=ACCESSORYTYPE_CHOICES)
class Cart(models.Model):
items = models.ManyToManyField(Item)
The cart has a manytomany relationship with the item superclass. How
is it possible to get the derived class back though from the
superclass that is stored in the Cart.items field, or is there a
better way of doing this. Will I have to resort to queries through
all of the derived classes checking for the id's that match those of
the objects in Cart.items so something like this:
for elem in cart.items.all():
b = UsedBike.objects.all().filter(id=elem.id)
or is there a neater way of doing this.
Cheers
Simon
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