Django, how to make a discount for a product?

Question

Django

there is a product model in which there is a price field, you need to implement a discount. I made a similar field in the product model for a discount, but now how can I make it so that when a discount is set in the admin panel, it is automatically calculated and the amount of the discounted product already gets into the basket?

class Product(models. Model):
    category = models.ForeignKey(Category, related_name='product', verbose_name='Категория')
    name = models.CharField(max_length=200, db_index=True, verbose_name='Название')
    slug = models.SlugField(max_length=200, db_index=True, verbose_name='Транслит')
    image = models.ImageField(upload_to='products/%y/%m/%d/', blank=True, verbose_name='Изображение товара')
    description = models.TextField(blank=True, verbose_name='Описание')
    price = models.DecimalField(max_digits=10, decimal_places=2, verbose_name='Цена')
    discount = models.DecimalField(max_digits=10, decimal_places=2, blank=True, null=True, verbose_name='Скидка')

Answer 1

You can add a percentage discount field in the product model like this:
In the same model, add a method for obtaining this discount:

def get_sale(self):
        '''Расчитать стоимость со скидкой'''
        price = int(self.price * (100 - self.sale) / 100)
        return price

In a template or cart, you can get the total price like this:
{{ product.get_sale }}

Answer 2

@property
def get_final_price:
  return self.price - self.price * self.discount