text: from django.db import models
  from django.utils import timezone
  
  
  class Post(models.Model):
      author = models.ForeignKey('auth.User', on_delete=models.CASCADE)
      title = models.CharField(max_length=200)
      text = models.TextField()
      created_date = models.DateTimeField(default=timezone.now)
      published_date = models.DateTimeField(blank=True, null=True)
      def publish(self):
          self.published_date = timezone.now()
          self.save()
  
      def __str__(self):
          return self.title