old_contents: from django.db import models
  from django.test import TestCase
  from rest_framework import serializers
  
  
  # ForeignKey
  
  class ForeignKeyTarget(models.Model):
      name = models.CharField(max_length=100)
  
  
  class ForeignKeySource(models.Model):
      name = models.CharField(max_length=100)
      target = models.ForeignKey(ForeignKeyTarget, related_name='sources')
  
  
  class ForeignKeySourceSerializer(serializers.ModelSerializer):
      class Meta:
          model = ForeignKeySource
  
  
  class ForeignKeyTargetSerializer(serializers.ModelSerializer):
      sources = ForeignKeySourceSerializer()
  
      class Meta:
          model = ForeignKeyTarget
  
  
  class ReverseForeignKeyTests(TestCase):
      def setUp(self):
          target = ForeignKeyTarget(name='target-1')
          target.save()
          new_target = ForeignKeyTarget(name='target-2')
          new_target.save()
          for idx in range(1, 4):
              source = ForeignKeySource(name='source-%d' % idx, target=target)
              source.save()
          self.target_data = {'id': 1, 'name': u'target-1', 'sources': [
                  {'id': 1, 'name': u'source-1', 'target': 1},
                  {'id': 2, 'name': u'source-2', 'target': 1},
                  {'id': 3, 'name': u'source-3', 'target': 1},
              ]}
          self.new_target_data = {'id': 2, 'name': u'target-2', 'sources': []}
          self.data = [self.target_data, self.new_target_data]
  
      def check_serialized_targets(self, data):
          queryset = ForeignKeyTarget.objects.all()
          serializer = ForeignKeyTargetSerializer(queryset)
          self.assertEquals(serializer.data, data)
  
      def test_reverse_foreign_key_retrieve(self):
          self.check_serialized_targets(self.data)
  
new_contents: from django.db import models
  from django.test import TestCase
  from rest_framework import serializers
  
  
  # ForeignKey
  
  class ForeignKeyTarget(models.Model):
      name = models.CharField(max_length=100)
  
  
  class ForeignKeySource(models.Model):
      name = models.CharField(max_length=100)
      target = models.ForeignKey(ForeignKeyTarget, related_name='sources')
  
  
  class ForeignKeySourceSerializer(serializers.ModelSerializer):
      class Meta:
          model = ForeignKeySource
  
  
  class ForeignKeyTargetSerializer(serializers.ModelSerializer):
      sources = ForeignKeySourceSerializer()
  
      class Meta:
          model = ForeignKeyTarget
  
  
  class ReverseForeignKeyTests(TestCase):
      def setUp(self):
          target = ForeignKeyTarget(name='target-1')
          target.save()
          new_target = ForeignKeyTarget(name='target-2')
          new_target.save()
          for idx in range(1, 4):
              source = ForeignKeySource(name='source-%d' % idx, target=target)
              source.save()
  
      def test_reverse_foreign_key_retrieve(self):
          queryset = ForeignKeyTarget.objects.all()
          serializer = ForeignKeyTargetSerializer(queryset)
          expected = [
              {'id': 1, 'name': u'target-1', 'sources': [
                  {'id': 1, 'name': u'source-1', 'target': 1},
                  {'id': 2, 'name': u'source-2', 'target': 1},
                  {'id': 3, 'name': u'source-3', 'target': 1},
              ]},
              {'id': 2, 'name': u'target-2', 'sources': [
              ]}
          ]
          self.assertEquals(serializer.data, expected)
  
subject: Make nested tests consistent with pk and hyperlink tests