from django.db import models

   class Counter_agent(models.Model):
       id = models.AutoField(primary_key=True)

       def __str__(self):
           return f' Counter_agent {self.id}'

   class element(models.Model):
       id = models.AutoField(primary_key=True)
       external_id = models.IntegerField()
       type = models.CharField(max_length=100)
       photo = models.ImageField(upload_to='.')
       dop_text = models.TextField()
       Counter_agent = models.ForeignKey(Counter_agent, related_name='element', on_delete=models.CASCADE)

       def __str__(self):
           return f' element {self.id} (Counter_agent {self.Counter_agent.id})'