old_contents: from __future__ import unicode_literals
  from django.db import models
  from django.test import TestCase
  from rest_framework import serializers
  from tests.models import RESTFrameworkModel
  
  
  # Models
  class ParentModel(RESTFrameworkModel):
      name1 = models.CharField(max_length=100)
  
  
  class ChildModel(ParentModel):
      name2 = models.CharField(max_length=100)
  
  
  class AssociatedModel(RESTFrameworkModel):
      ref = models.OneToOneField(ParentModel, primary_key=True)
      name = models.CharField(max_length=100)
  
  
  # Serializers
  class DerivedModelSerializer(serializers.ModelSerializer):
      class Meta:
          model = ChildModel
  
  
  class AssociatedModelSerializer(serializers.ModelSerializer):
      class Meta:
          model = AssociatedModel
  
  
  # Tests
  class InheritedModelSerializationTests(TestCase):
  
      def test_multitable_inherited_model_fields_as_expected(self):
          """
          Assert that the parent pointer field is not included in the fields
          serialized fields
          """
          child = ChildModel(name1='parent name', name2='child name')
          serializer = DerivedModelSerializer(child)
          self.assertEqual(set(serializer.data.keys()),
                           set(['name1', 'name2', 'id']))
  
      def test_onetoone_primary_key_model_fields_as_expected(self):
          """
          Assert that a model with a onetoone field that is the primary key is
          not treated like a derived model
          """
          parent = ParentModel(name1='parent name')
          associate = AssociatedModel(name='hello', ref=parent)
          serializer = AssociatedModelSerializer(associate)
          self.assertEqual(set(serializer.data.keys()),
                           set(['name', 'ref']))
  
      def test_data_is_valid_without_parent_ptr(self):
          """
          Assert that the pointer to the parent table is not a required field
          for input data
          """
          data = {
              'name1': 'parent name',
              'name2': 'child name',
          }
          serializer = DerivedModelSerializer(data=data)
          self.assertEqual(serializer.is_valid(), True)
  
new_contents: from __future__ import unicode_literals
  from django.db import models
  from django.test import TestCase
  from rest_framework import serializers
  from tests.models import RESTFrameworkModel
  
  
  # Models
  class ParentModel(RESTFrameworkModel):
      name1 = models.CharField(max_length=100)
  
  
  class ChildModel(ParentModel):
      name2 = models.CharField(max_length=100)
  
  
  class AssociatedModel(RESTFrameworkModel):
      ref = models.OneToOneField(ParentModel, primary_key=True)
      name = models.CharField(max_length=100)
  
  
  # Serializers
  class DerivedModelSerializer(serializers.ModelSerializer):
      class Meta:
          model = ChildModel
  
  
  class AssociatedModelSerializer(serializers.ModelSerializer):
      class Meta:
          model = AssociatedModel
  
  
  # Tests
  class InheritedModelSerializationTests(TestCase):
  
      def test_multitable_inherited_model_fields_as_expected(self):
          """
          Assert that the parent pointer field is not included in the fields
          serialized fields
          """
          child = ChildModel(name1='parent name', name2='child name')
          serializer = DerivedModelSerializer(child)
          self.assertEqual(set(serializer.data.keys()),
                           set(['name1', 'name2', 'id']))
  
      def test_onetoone_primary_key_model_fields_as_expected(self):
          """
          Assert that a model with a onetoone field that is the primary key is
          not treated like a derived model
          """
          parent = ParentModel.objects.create(name1='parent name')
          associate = AssociatedModel.objects.create(name='hello', ref=parent)
          serializer = AssociatedModelSerializer(associate)
          self.assertEqual(set(serializer.data.keys()),
                           set(['name', 'ref']))
  
      def test_data_is_valid_without_parent_ptr(self):
          """
          Assert that the pointer to the parent table is not a required field
          for input data
          """
          data = {
              'name1': 'parent name',
              'name2': 'child name',
          }
          serializer = DerivedModelSerializer(data=data)
          self.assertEqual(serializer.is_valid(), True)
  
subject: Save objects before assigning them in InheritedModelSerializationTests; Django 1.8 now throws an error when assigning unsaved objects to Foreign Key, GenericForeignKey, and OneToOneFields