class Post(models.Model):
    title = models.CharField(max_length=100,blank=True,db_index=True)
    body = models.TextField(max_length=500,blank=True,db_index=True)
    date_pub = models.DateTimeField(auto_now_add=True)
    author = models.ForeignKey('User', related_name='posts',on_delete=models.PROTECT)