Django coupon system?

Question

Django

Good afternoon everyone. Implemented a coupon system, but with a one-to-many relationship to product categories (i.e. for all products in a given category). How to implement correctly with m2m connection so that 1 coupon has many categories?
I would be grateful for examples and hints. Thanks

Answer 1

class Category(models.Model):
    pass

class Coupon(models.Model):
    categories = models.ManyToManyField('Category')

coupon = Coupon.objects.create()
categories = Category.objects.filter(id__in=[1, 2])
coupon.categories.add(categories)