text: from django.db import models
  from django.contrib.auth.models import User
  
  
  class Office(models.Model):
      name = models.CharField(max_length=50)
      manager = models.ForeignKey(User, on_delete=models.SET_NULL)
  
  class Issue(models.Model):
      description = models.CharField(max_length=100)
      owner = models.ForeignKey(User, on_delete=models.SET_NULL)
      office = models.ForeignKey(Office, on_delete=models.SET_NULL)
  
  