'''class Brand(models.Model):
name = models.TextField()
#
@python_2_unicode_compatibleclass Product(models.Model):
name = models.TextField(_('name'))
article = models.TextField(_('article'))
series = models.TextField(_('series'))
manufacturercode = models.TextField(_('manufacturercode'))
brand = models.ManyToManyField(Brand,through="product_brand",through_fields=('id_product','id_brand'))'''