Sample django models

gistfile1.py

class Category(models.Model):
  name = models.CharField()

class Attribute(models.Model):
  category = models.ForeignKey(Category)
  name = models.CharField

class Item(models.Model):
  slug = models.SlugField()
  price = models.DecimalField()
  remaining = models.IntegerField()
  category = models.ForeignKey(Category)
  description = models.CharField()
  attributes = models.ManyToManyField(Attribute, through='ItemAttribute')

class ItemAttribute(models.Model):
  item= models.ForeignKey(Item)
  attribute = models.ForeignKey(Attribute)
  value = models.CharField()