text: """
  Testing of admin inline formsets.
  """
  import random
  
  from django.contrib.contenttypes.fields import GenericForeignKey
  from django.contrib.contenttypes.models import ContentType
  from django.db import models
  
  
  class Parent(models.Model):
      name = models.CharField(max_length=50)
  
      def __str__(self):
          return self.name
  
  
  class Teacher(models.Model):
      name = models.CharField(max_length=50)
  
      def __str__(self):
          return self.name
  
  
  class Child(models.Model):
      name = models.CharField(max_length=50)
      teacher = models.ForeignKey(Teacher, models.CASCADE)
  
      content_type = models.ForeignKey(ContentType, models.CASCADE)
      object_id = models.PositiveIntegerField()
      parent = GenericForeignKey()
  
      def __str__(self):
          return 'I am %s, a child of %s' % (self.name, self.parent)
  
  
  class Book(models.Model):
      name = models.CharField(max_length=50)
  
  
  class Author(models.Model):
      name = models.CharField(max_length=50)
      books = models.ManyToManyField(Book)
  
  
  class NonAutoPKBook(models.Model):
      rand_pk = models.IntegerField(primary_key=True, editable=False)
      author = models.ForeignKey(Author, models.CASCADE)
      title = models.CharField(max_length=50)
  
      def save(self, *args, **kwargs):
          while not self.rand_pk:
              test_pk = random.randint(1, 99999)
              if not NonAutoPKBook.objects.filter(rand_pk=test_pk).exists():
                  self.rand_pk = test_pk
          super().save(*args, **kwargs)
  
  
  class EditablePKBook(models.Model):
      manual_pk = models.IntegerField(primary_key=True)
      author = models.ForeignKey(Author, models.CASCADE)
      title = models.CharField(max_length=50)
  
  
  class Holder(models.Model):
      dummy = models.IntegerField()
  
  
  class Inner(models.Model):
      dummy = models.IntegerField()
      holder = models.ForeignKey(Holder, models.CASCADE)
      readonly = models.CharField("Inner readonly label", max_length=1)
  
      def get_absolute_url(self):
          return '/inner/'
  
  
  class Holder2(models.Model):
      dummy = models.IntegerField()
  
  
  class Inner2(models.Model):
      dummy = models.IntegerField()
      holder = models.ForeignKey(Holder2, models.CASCADE)
  
  
  class Holder3(models.Model):
      dummy = models.IntegerField()
  
  
  class Inner3(models.Model):
      dummy = models.IntegerField()
      holder = models.ForeignKey(Holder3, models.CASCADE)
  
  # Models for ticket #8190
  
  
  class Holder4(models.Model):
      dummy = models.IntegerField()
  
  
  class Inner4Stacked(models.Model):
      dummy = models.IntegerField(help_text="Awesome stacked help text is awesome.")
      holder = models.ForeignKey(Holder4, models.CASCADE)
  
  
  class Inner4Tabular(models.Model):
      dummy = models.IntegerField(help_text="Awesome tabular help text is awesome.")
      holder = models.ForeignKey(Holder4, models.CASCADE)
  
  # Models for #12749
  
  
  class Person(models.Model):
      firstname = models.CharField(max_length=15)
  
  
  class OutfitItem(models.Model):
      name = models.CharField(max_length=15)
  
  
  class Fashionista(models.Model):
      person = models.OneToOneField(Person, models.CASCADE, primary_key=True)
      weaknesses = models.ManyToManyField(OutfitItem, through='ShoppingWeakness', blank=True)
  
  
  class ShoppingWeakness(models.Model):
      fashionista = models.ForeignKey(Fashionista, models.CASCADE)
      item = models.ForeignKey(OutfitItem, models.CASCADE)
  
  # Models for #13510
  
  
  class TitleCollection(models.Model):
      pass
  
  
  class Title(models.Model):
      collection = models.ForeignKey(TitleCollection, models.SET_NULL, blank=True, null=True)
      title1 = models.CharField(max_length=100)
      title2 = models.CharField(max_length=100)
  
  # Models for #15424
  
  
  class Poll(models.Model):
      name = models.CharField(max_length=40)
  
  
  class Question(models.Model):
      poll = models.ForeignKey(Poll, models.CASCADE)
  
  
  class Novel(models.Model):
      name = models.CharField(max_length=40)
  
  
  class Chapter(models.Model):
      name = models.CharField(max_length=40)
      novel = models.ForeignKey(Novel, models.CASCADE)
  
  
  class FootNote(models.Model):
      """
      Model added for ticket 19838
      """
      chapter = models.ForeignKey(Chapter, models.PROTECT)
      note = models.CharField(max_length=40)
  
  # Models for #16838
  
  
  class CapoFamiglia(models.Model):
      name = models.CharField(max_length=100)
  
  
  class Consigliere(models.Model):
      name = models.CharField(max_length=100, help_text='Help text for Consigliere')
      capo_famiglia = models.ForeignKey(CapoFamiglia, models.CASCADE, related_name='+')
  
  
  class SottoCapo(models.Model):
      name = models.CharField(max_length=100)
      capo_famiglia = models.ForeignKey(CapoFamiglia, models.CASCADE, related_name='+')
  
  
  class ReadOnlyInline(models.Model):
      name = models.CharField(max_length=100, help_text='Help text for ReadOnlyInline')
      capo_famiglia = models.ForeignKey(CapoFamiglia, models.CASCADE)
  
  
  # Models for #18433
  
  class ParentModelWithCustomPk(models.Model):
      my_own_pk = models.CharField(max_length=100, primary_key=True)
      name = models.CharField(max_length=100)
  
  
  class ChildModel1(models.Model):
      my_own_pk = models.CharField(max_length=100, primary_key=True)
      name = models.CharField(max_length=100)
      parent = models.ForeignKey(ParentModelWithCustomPk, models.CASCADE)
  
      def get_absolute_url(self):
          return '/child_model1/'
  
  
  class ChildModel2(models.Model):
      my_own_pk = models.CharField(max_length=100, primary_key=True)
      name = models.CharField(max_length=100)
      parent = models.ForeignKey(ParentModelWithCustomPk, models.CASCADE)
  
      def get_absolute_url(self):
          return '/child_model2/'
  
  
  # Models for #19425
  class BinaryTree(models.Model):
      name = models.CharField(max_length=100)
      parent = models.ForeignKey('self', models.SET_NULL, null=True, blank=True)
  
  # Models for #19524
  
  
  class LifeForm(models.Model):
      pass
  
  
  class ExtraTerrestrial(LifeForm):
      name = models.CharField(max_length=100)
  
  
  class Sighting(models.Model):
      et = models.ForeignKey(ExtraTerrestrial, models.CASCADE)
      place = models.CharField(max_length=100)
  
  
  # Models for #18263
  class SomeParentModel(models.Model):
      name = models.CharField(max_length=1)
  
  
  class SomeChildModel(models.Model):
      name = models.CharField(max_length=1)
      position = models.PositiveIntegerField()
      parent = models.ForeignKey(SomeParentModel, models.CASCADE)
  
  # Other models
  
  
  class ProfileCollection(models.Model):
      pass
  
  
  class Profile(models.Model):
      collection = models.ForeignKey(ProfileCollection, models.SET_NULL, blank=True, null=True)
      first_name = models.CharField(max_length=100)
      last_name = models.CharField(max_length=100)
  