How to handle data from model in views?

Question

Django

class QuantityComponent(models.Model): #подсчитанные компоненты к прибору
  part_number = models.ForeignKey(Component, on_delete=models.CASCADE)
  quantity = models.IntegerField('quantity', null=True, blank=True)
  def multiple(self):
      summ = self.quantity * 5
      return summ

def countspecification(request, device, multiple):
    context = {}
    quantityGroupComponentsForDevice = QuantityComponent.objects.filter(groupcomponents__name__contains = device)
    context['result'] = quantityGroupComponentsForDevice
    return render(request, "groupcomponents.html", context)

It is necessary to self.quantity
multiply the value by the passed parameter from the request.

Answer 1

The problem is solved by overriding the save() method of the model.