old_contents: from django.db import models
  
  class Project(models.Model):
      project_name = models.CharField(max_length=200)
      playbook_path = models.CharField(max_length=200, default="~/")
      ansible_config_path = models.CharField(max_length=200, default="~/")
      default_inventory = models.CharField(max_length=200, default="hosts")
      default_user = models.CharField(max_length=200, default="ubuntu")
  
new_contents: from django.db import models
  
  class Project(models.Model):
      project_name = models.CharField(max_length=200)
      playbook_path = models.CharField(max_length=200, default="~/")
      ansible_config_path = models.CharField(max_length=200, default="~/")
      default_inventory = models.CharField(max_length=200, default="hosts")
      default_user = models.CharField(max_length=200, default="ubuntu")
  
  
  class Registry(models.Model):
      project = models.OneToOneField(
          Project,
          on_delete=models.CASCADE,
          primary_key=True,
      )
      name = models.CharField(max_length=200)
  
      def __str__(self):
          return "project name: %s" % self.project.project_name
  
subject: Add Registry in Ansible models