multiplication in django template without using manually created template tag

Question

I want to achieve multiplication operation in django template. For example I have the values, price=10.50 quantity=3

With the help of this link

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Answer 1

Another approach that I have used seems cleaner to me. If you are going through a queryset, it doesn't make sense to compute the values in your view. Instead, add the calculation as a function in your model!

Let's say your model looks like this:

Class LineItem:
    product = models.ForeignKey(Product)
    quantity = models.IntegerField()
    price = models.DecimalField(decimal_places=2)

Simply add the following to the model:

    def line_total(self):
        return self.quantity * self.price

Now you can simply treat line_total as if it were a field in the record:

{{ line_item.line_total }}

This allows the line_total value to be used anywhere, either in templates or views, and ensures that it is always consistent, without taking up space in the database.