text: from django.db import models
  from django.core.validators import (
      MinValueValidator,
      MaxValueValidator,
  )
  
  
  class Coupon(models.Model):
      code = models.CharField(max_length=50, unique=True)
      valid_from = models.DateTimeField()
      valid_to = models.DateTimeField()
      discount = models.IntegerField(
          validators=[
              MinValueValidator(0),
              MaxValueValidator(100)
          ]
      )
      active = models.BooleanField()
  
      def __str__(self):
          return self.code
  