class Color(models.Model):
    title = models.CharField(max_length=30)
    code = models.CharField(max_length=7)
    def __unicode__(self):
        return '{0} ({1})'.format(self.title, self.code)
class Size(models.Model):
    title = models.CharField(max_length=20)
class Image(models.Model):
    color = models.ForeignKey(Color)
    src = models.ImageField(upload_to='media/img/')
    alt = models.CharField(max_length=255)
    '''
    object_id = models.PositiveIntegerField()
    content_type = models.ForeignKey(ContentType)
    of = generic.GenericForeignKey('content-type', 'object_id')
    '''
    def __unicode__(self):
        return '{0} ({1})'.format(self.alt, self.color.title)
class Manufacturer(models.Model):
    title = models.CharField(max_length=255)
    image = models.OneToOneField(Image, parent_link=True)
    def __unicode__(self):
        return self.title
class Product(models.Model):
    title = models.CharField(max_length=255)
    manufacturer = models.ForeignKey(Manufacturer)
    description = models.TextField()
    price = models.DecimalField(max_digits=8, decimal_places=2)
    image = models.ManyToManyField(Image)
    pub_date = models.DateTimeField('Date published')
    mod_date = models.DateTimeField('Date modified')