How to implement from an architectural point of view the display of the cost with or without a discount in the model?

Question

Django

Tell me how to implement correctly from an architectural point of view the display of the cost of goods with or without a discount. There is a model in which two values ​​are stored. The user can activate the promo code and then we need to display the cost on the page depending on it. So, now I did the following. In the template, I check if a discount has been applied, and if so, then I display the discounted value, if not, then something else. But I don't like the solution. Somehow it looks awful. Maybe you need to make a method for the model, to which to pass the parameter whether there was a discount or not, and then already in this method to return the correct value? There may be other options that I'm not aware of.

Answer 1

1. Make a model of promo codes that stores the promo code itself and the amount of discount it gives.
   
2. In the product model, implement property current_price , which returns the value of the price field with a discount, if applicable, or just the value of the field, if not.
   
3. In the template just output {{ item.current_price }}