text: from django.db import models
  
  CHOICES = (
      (1, 'first'),
      (2, 'second'),
  )
  
  
  class Article(models.Model):
      headline = models.CharField(max_length=100, default='Default headline')
      pub_date = models.DateTimeField()
      status = models.IntegerField(blank=True, null=True, choices=CHOICES)
      misc_data = models.CharField(max_length=100, blank=True)
      article_text = models.TextField()
  
      class Meta:
          ordering = ('pub_date', 'headline')
          # A utf-8 verbose name (Ångström's Articles) to test they are valid.
          verbose_name = "\xc3\x85ngstr\xc3\xb6m's Articles"
  
      def __str__(self):
          return self.headline
  
  
  class Movie(models.Model):
      # Test models with non-default primary keys / AutoFields #5218
      movie_id = models.AutoField(primary_key=True)
      name = models.CharField(max_length=60)
  
  
  class Party(models.Model):
      when = models.DateField(null=True)
  
  
  class Event(models.Model):
      when = models.DateTimeField()
  
  
  class Department(models.Model):
      id = models.PositiveIntegerField(primary_key=True)
      name = models.CharField(max_length=200)
  
      def __str__(self):
          return self.name
  
  
  class Worker(models.Model):
      department = models.ForeignKey(Department, models.CASCADE)
      name = models.CharField(max_length=200)
  
      def __str__(self):
          return self.name
  
  
  class NonAutoPK(models.Model):
      name = models.CharField(max_length=10, primary_key=True)
  
  
  # Chained foreign keys with to_field produce incorrect query #18432
  class Model1(models.Model):
      pkey = models.IntegerField(unique=True, db_index=True)
  
  
  class Model2(models.Model):
      model1 = models.ForeignKey(Model1, models.CASCADE, unique=True, to_field='pkey')
  
  
  class Model3(models.Model):
      model2 = models.ForeignKey(Model2, models.CASCADE, unique=True, to_field='model1')
  