Define an order for ManyToManyField by through model field

Question on Stackoverflow: http://stackoverflow.com/questions/33486705/define-an-order-for-manytomanyfield-by-through-model-field-with-django

    class ProductRelation(models.Model):
        product_a = models.ForeignKey('Product', related_name='c+')
        product_a_rank = models.PositiveSmallIntegerField('Position')
        product_b = models.ForeignKey('Product', related_name='c+')
        product_b_rank = models.PositiveSmallIntegerField('Postition')


    class Product(models.Model):
        b_products = models.ManyToManyField('self', through=ProductRelation, symmetrical=False,
        through_fields=('product_a', 'product_b'),
        related_name='a_products')

Hello. I have `product` Product instance. How can I get those ordered results?

  

product.b_products.all().order_by('product_b_rank')

and  

product.a_products.all().order_by('product_a_rank')

Django 1.8

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