django-rest-framework/tests/test_relations_hyperlink.py

from __future__ import unicode_literals
from django.conf.urls import patterns, url
from django.test import TestCase
from rest_framework import serializers
from rest_framework.test import APIRequestFactory
from tests.models import (
    ManyToManyTarget, ManyToManySource, ForeignKeyTarget, ForeignKeySource,
    NullableForeignKeySource, OneToOneTarget, NullableOneToOneSource
)

factory = APIRequestFactory()
request = factory.get('/')  # Just to ensure we have a request in the serializer context


dummy_view = lambda request, pk: None

urlpatterns = patterns(
    '',
    url(r'^dummyurl/(?P<pk>[0-9]+)/$', dummy_view, name='dummy-url'),
    url(r'^manytomanysource/(?P<pk>[0-9]+)/$', dummy_view, name='manytomanysource-detail'),
    url(r'^manytomanytarget/(?P<pk>[0-9]+)/$', dummy_view, name='manytomanytarget-detail'),
    url(r'^foreignkeysource/(?P<pk>[0-9]+)/$', dummy_view, name='foreignkeysource-detail'),
    url(r'^foreignkeytarget/(?P<pk>[0-9]+)/$', dummy_view, name='foreignkeytarget-detail'),
    url(r'^nullableforeignkeysource/(?P<pk>[0-9]+)/$', dummy_view, name='nullableforeignkeysource-detail'),
    url(r'^onetoonetarget/(?P<pk>[0-9]+)/$', dummy_view, name='onetoonetarget-detail'),
    url(r'^nullableonetoonesource/(?P<pk>[0-9]+)/$', dummy_view, name='nullableonetoonesource-detail'),
)


# ManyToMany
class ManyToManyTargetSerializer(serializers.HyperlinkedModelSerializer):
    class Meta:
        model = ManyToManyTarget
        fields = ('url', 'name', 'sources')


class ManyToManySourceSerializer(serializers.HyperlinkedModelSerializer):
    class Meta:
        model = ManyToManySource
        fields = ('url', 'name', 'targets')


# ForeignKey
class ForeignKeyTargetSerializer(serializers.HyperlinkedModelSerializer):
    class Meta:
        model = ForeignKeyTarget
        fields = ('url', 'name', 'sources')


class ForeignKeySourceSerializer(serializers.HyperlinkedModelSerializer):
    class Meta:
        model = ForeignKeySource
        fields = ('url', 'name', 'target')


# Nullable ForeignKey
class NullableForeignKeySourceSerializer(serializers.HyperlinkedModelSerializer):
    class Meta:
        model = NullableForeignKeySource
        fields = ('url', 'name', 'target')


# Nullable OneToOne
class NullableOneToOneTargetSerializer(serializers.HyperlinkedModelSerializer):
    class Meta:
        model = OneToOneTarget
        fields = ('url', 'name', 'nullable_source')


# TODO: Add test that .data cannot be accessed prior to .is_valid

class HyperlinkedManyToManyTests(TestCase):
    urls = 'tests.test_relations_hyperlink'

    def setUp(self):
        for idx in range(1, 4):
            target = ManyToManyTarget(name='target-%d' % idx)
            target.save()
            source = ManyToManySource(name='source-%d' % idx)
            source.save()
            for target in ManyToManyTarget.objects.all():
                source.targets.add(target)

    def test_many_to_many_retrieve(self):
        queryset = ManyToManySource.objects.all()
        serializer = ManyToManySourceSerializer(queryset, many=True, context={'request': request})
        expected = [
            {'url': 'http://testserver/manytomanysource/1/', 'name': 'source-1', 'targets': ['http://testserver/manytomanytarget/1/']},
            {'url': 'http://testserver/manytomanysource/2/', 'name': 'source-2', 'targets': ['http://testserver/manytomanytarget/1/', 'http://testserver/manytomanytarget/2/']},
            {'url': 'http://testserver/manytomanysource/3/', 'name': 'source-3', 'targets': ['http://testserver/manytomanytarget/1/', 'http://testserver/manytomanytarget/2/', 'http://testserver/manytomanytarget/3/']}
        ]
        self.assertEqual(serializer.data, expected)

    def test_reverse_many_to_many_retrieve(self):
        queryset = ManyToManyTarget.objects.all()
        serializer = ManyToManyTargetSerializer(queryset, many=True, context={'request': request})
        expected = [
            {'url': 'http://testserver/manytomanytarget/1/', 'name': 'target-1', 'sources': ['http://testserver/manytomanysource/1/', 'http://testserver/manytomanysource/2/', 'http://testserver/manytomanysource/3/']},
            {'url': 'http://testserver/manytomanytarget/2/', 'name': 'target-2', 'sources': ['http://testserver/manytomanysource/2/', 'http://testserver/manytomanysource/3/']},
            {'url': 'http://testserver/manytomanytarget/3/', 'name': 'target-3', 'sources': ['http://testserver/manytomanysource/3/']}
        ]
        self.assertEqual(serializer.data, expected)

    def test_many_to_many_update(self):
        data = {'url': 'http://testserver/manytomanysource/1/', 'name': 'source-1', 'targets': ['http://testserver/manytomanytarget/1/', 'http://testserver/manytomanytarget/2/', 'http://testserver/manytomanytarget/3/']}
        instance = ManyToManySource.objects.get(pk=1)
        serializer = ManyToManySourceSerializer(instance, data=data, context={'request': request})
        self.assertTrue(serializer.is_valid())
        serializer.save()
        self.assertEqual(serializer.data, data)

        # Ensure source 1 is updated, and everything else is as expected
        queryset = ManyToManySource.objects.all()
        serializer = ManyToManySourceSerializer(queryset, many=True, context={'request': request})
        expected = [
            {'url': 'http://testserver/manytomanysource/1/', 'name': 'source-1', 'targets': ['http://testserver/manytomanytarget/1/', 'http://testserver/manytomanytarget/2/', 'http://testserver/manytomanytarget/3/']},
            {'url': 'http://testserver/manytomanysource/2/', 'name': 'source-2', 'targets': ['http://testserver/manytomanytarget/1/', 'http://testserver/manytomanytarget/2/']},
            {'url': 'http://testserver/manytomanysource/3/', 'name': 'source-3', 'targets': ['http://testserver/manytomanytarget/1/', 'http://testserver/manytomanytarget/2/', 'http://testserver/manytomanytarget/3/']}
        ]
        self.assertEqual(serializer.data, expected)

    def test_reverse_many_to_many_update(self):
        data = {'url': 'http://testserver/manytomanytarget/1/', 'name': 'target-1', 'sources': ['http://testserver/manytomanysource/1/']}
        instance = ManyToManyTarget.objects.get(pk=1)
        serializer = ManyToManyTargetSerializer(instance, data=data, context={'request': request})
        self.assertTrue(serializer.is_valid())
        serializer.save()
        self.assertEqual(serializer.data, data)

        # Ensure target 1 is updated, and everything else is as expected
        queryset = ManyToManyTarget.objects.all()
        serializer = ManyToManyTargetSerializer(queryset, many=True, context={'request': request})
        expected = [
            {'url': 'http://testserver/manytomanytarget/1/', 'name': 'target-1', 'sources': ['http://testserver/manytomanysource/1/']},
            {'url': 'http://testserver/manytomanytarget/2/', 'name': 'target-2', 'sources': ['http://testserver/manytomanysource/2/', 'http://testserver/manytomanysource/3/']},
            {'url': 'http://testserver/manytomanytarget/3/', 'name': 'target-3', 'sources': ['http://testserver/manytomanysource/3/']}

        ]
        self.assertEqual(serializer.data, expected)

    def test_many_to_many_create(self):
        data = {'url': 'http://testserver/manytomanysource/4/', 'name': 'source-4', 'targets': ['http://testserver/manytomanytarget/1/', 'http://testserver/manytomanytarget/3/']}
        serializer = ManyToManySourceSerializer(data=data, context={'request': request})
        self.assertTrue(serializer.is_valid())
        obj = serializer.save()
        self.assertEqual(serializer.data, data)
        self.assertEqual(obj.name, 'source-4')

        # Ensure source 4 is added, and everything else is as expected
        queryset = ManyToManySource.objects.all()
        serializer = ManyToManySourceSerializer(queryset, many=True, context={'request': request})
        expected = [
            {'url': 'http://testserver/manytomanysource/1/', 'name': 'source-1', 'targets': ['http://testserver/manytomanytarget/1/']},
            {'url': 'http://testserver/manytomanysource/2/', 'name': 'source-2', 'targets': ['http://testserver/manytomanytarget/1/', 'http://testserver/manytomanytarget/2/']},
            {'url': 'http://testserver/manytomanysource/3/', 'name': 'source-3', 'targets': ['http://testserver/manytomanytarget/1/', 'http://testserver/manytomanytarget/2/', 'http://testserver/manytomanytarget/3/']},
            {'url': 'http://testserver/manytomanysource/4/', 'name': 'source-4', 'targets': ['http://testserver/manytomanytarget/1/', 'http://testserver/manytomanytarget/3/']}
        ]
        self.assertEqual(serializer.data, expected)

    def test_reverse_many_to_many_create(self):
        data = {'url': 'http://testserver/manytomanytarget/4/', 'name': 'target-4', 'sources': ['http://testserver/manytomanysource/1/', 'http://testserver/manytomanysource/3/']}
        serializer = ManyToManyTargetSerializer(data=data, context={'request': request})
        self.assertTrue(serializer.is_valid())
        obj = serializer.save()
        self.assertEqual(serializer.data, data)
        self.assertEqual(obj.name, 'target-4')

        # Ensure target 4 is added, and everything else is as expected
        queryset = ManyToManyTarget.objects.all()
        serializer = ManyToManyTargetSerializer(queryset, many=True, context={'request': request})
        expected = [
            {'url': 'http://testserver/manytomanytarget/1/', 'name': 'target-1', 'sources': ['http://testserver/manytomanysource/1/', 'http://testserver/manytomanysource/2/', 'http://testserver/manytomanysource/3/']},
            {'url': 'http://testserver/manytomanytarget/2/', 'name': 'target-2', 'sources': ['http://testserver/manytomanysource/2/', 'http://testserver/manytomanysource/3/']},
            {'url': 'http://testserver/manytomanytarget/3/', 'name': 'target-3', 'sources': ['http://testserver/manytomanysource/3/']},
            {'url': 'http://testserver/manytomanytarget/4/', 'name': 'target-4', 'sources': ['http://testserver/manytomanysource/1/', 'http://testserver/manytomanysource/3/']}
        ]
        self.assertEqual(serializer.data, expected)


class HyperlinkedForeignKeyTests(TestCase):
    urls = 'tests.test_relations_hyperlink'

    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_foreign_key_retrieve(self):
        queryset = ForeignKeySource.objects.all()
        serializer = ForeignKeySourceSerializer(queryset, many=True, context={'request': request})
        expected = [
            {'url': 'http://testserver/foreignkeysource/1/', 'name': 'source-1', 'target': 'http://testserver/foreignkeytarget/1/'},
            {'url': 'http://testserver/foreignkeysource/2/', 'name': 'source-2', 'target': 'http://testserver/foreignkeytarget/1/'},
            {'url': 'http://testserver/foreignkeysource/3/', 'name': 'source-3', 'target': 'http://testserver/foreignkeytarget/1/'}
        ]
        self.assertEqual(serializer.data, expected)

    def test_reverse_foreign_key_retrieve(self):
        queryset = ForeignKeyTarget.objects.all()
        serializer = ForeignKeyTargetSerializer(queryset, many=True, context={'request': request})
        expected = [
            {'url': 'http://testserver/foreignkeytarget/1/', 'name': 'target-1', 'sources': ['http://testserver/foreignkeysource/1/', 'http://testserver/foreignkeysource/2/', 'http://testserver/foreignkeysource/3/']},
            {'url': 'http://testserver/foreignkeytarget/2/', 'name': 'target-2', 'sources': []},
        ]
        self.assertEqual(serializer.data, expected)

    def test_foreign_key_update(self):
        data = {'url': 'http://testserver/foreignkeysource/1/', 'name': 'source-1', 'target': 'http://testserver/foreignkeytarget/2/'}
        instance = ForeignKeySource.objects.get(pk=1)
        serializer = ForeignKeySourceSerializer(instance, data=data, context={'request': request})
        self.assertTrue(serializer.is_valid())
        serializer.save()
        self.assertEqual(serializer.data, data)

        # Ensure source 1 is updated, and everything else is as expected
        queryset = ForeignKeySource.objects.all()
        serializer = ForeignKeySourceSerializer(queryset, many=True, context={'request': request})
        expected = [
            {'url': 'http://testserver/foreignkeysource/1/', 'name': 'source-1', 'target': 'http://testserver/foreignkeytarget/2/'},
            {'url': 'http://testserver/foreignkeysource/2/', 'name': 'source-2', 'target': 'http://testserver/foreignkeytarget/1/'},
            {'url': 'http://testserver/foreignkeysource/3/', 'name': 'source-3', 'target': 'http://testserver/foreignkeytarget/1/'}
        ]
        self.assertEqual(serializer.data, expected)

    def test_foreign_key_update_incorrect_type(self):
        data = {'url': 'http://testserver/foreignkeysource/1/', 'name': 'source-1', 'target': 2}
        instance = ForeignKeySource.objects.get(pk=1)
        serializer = ForeignKeySourceSerializer(instance, data=data, context={'request': request})
        self.assertFalse(serializer.is_valid())
        self.assertEqual(serializer.errors, {'target': ['Incorrect type. Expected URL string, received int.']})

    def test_reverse_foreign_key_update(self):
        data = {'url': 'http://testserver/foreignkeytarget/2/', 'name': 'target-2', 'sources': ['http://testserver/foreignkeysource/1/', 'http://testserver/foreignkeysource/3/']}
        instance = ForeignKeyTarget.objects.get(pk=2)
        serializer = ForeignKeyTargetSerializer(instance, data=data, context={'request': request})
        self.assertTrue(serializer.is_valid())
        # We shouldn't have saved anything to the db yet since save
        # hasn't been called.
        queryset = ForeignKeyTarget.objects.all()
        new_serializer = ForeignKeyTargetSerializer(queryset, many=True, context={'request': request})
        expected = [
            {'url': 'http://testserver/foreignkeytarget/1/', 'name': 'target-1', 'sources': ['http://testserver/foreignkeysource/1/', 'http://testserver/foreignkeysource/2/', 'http://testserver/foreignkeysource/3/']},
            {'url': 'http://testserver/foreignkeytarget/2/', 'name': 'target-2', 'sources': []},
        ]
        self.assertEqual(new_serializer.data, expected)

        serializer.save()
        self.assertEqual(serializer.data, data)

        # Ensure target 2 is update, and everything else is as expected
        queryset = ForeignKeyTarget.objects.all()
        serializer = ForeignKeyTargetSerializer(queryset, many=True, context={'request': request})
        expected = [
            {'url': 'http://testserver/foreignkeytarget/1/', 'name': 'target-1', 'sources': ['http://testserver/foreignkeysource/2/']},
            {'url': 'http://testserver/foreignkeytarget/2/', 'name': 'target-2', 'sources': ['http://testserver/foreignkeysource/1/', 'http://testserver/foreignkeysource/3/']},
        ]
        self.assertEqual(serializer.data, expected)

    def test_foreign_key_create(self):
        data = {'url': 'http://testserver/foreignkeysource/4/', 'name': 'source-4', 'target': 'http://testserver/foreignkeytarget/2/'}
        serializer = ForeignKeySourceSerializer(data=data, context={'request': request})
        self.assertTrue(serializer.is_valid())
        obj = serializer.save()
        self.assertEqual(serializer.data, data)
        self.assertEqual(obj.name, 'source-4')

        # Ensure source 1 is updated, and everything else is as expected
        queryset = ForeignKeySource.objects.all()
        serializer = ForeignKeySourceSerializer(queryset, many=True, context={'request': request})
        expected = [
            {'url': 'http://testserver/foreignkeysource/1/', 'name': 'source-1', 'target': 'http://testserver/foreignkeytarget/1/'},
            {'url': 'http://testserver/foreignkeysource/2/', 'name': 'source-2', 'target': 'http://testserver/foreignkeytarget/1/'},
            {'url': 'http://testserver/foreignkeysource/3/', 'name': 'source-3', 'target': 'http://testserver/foreignkeytarget/1/'},
            {'url': 'http://testserver/foreignkeysource/4/', 'name': 'source-4', 'target': 'http://testserver/foreignkeytarget/2/'},
        ]
        self.assertEqual(serializer.data, expected)

    def test_reverse_foreign_key_create(self):
        data = {'url': 'http://testserver/foreignkeytarget/3/', 'name': 'target-3', 'sources': ['http://testserver/foreignkeysource/1/', 'http://testserver/foreignkeysource/3/']}
        serializer = ForeignKeyTargetSerializer(data=data, context={'request': request})
        self.assertTrue(serializer.is_valid())
        obj = serializer.save()
        self.assertEqual(serializer.data, data)
        self.assertEqual(obj.name, 'target-3')

        # Ensure target 4 is added, and everything else is as expected
        queryset = ForeignKeyTarget.objects.all()
        serializer = ForeignKeyTargetSerializer(queryset, many=True, context={'request': request})
        expected = [
            {'url': 'http://testserver/foreignkeytarget/1/', 'name': 'target-1', 'sources': ['http://testserver/foreignkeysource/2/']},
            {'url': 'http://testserver/foreignkeytarget/2/', 'name': 'target-2', 'sources': []},
            {'url': 'http://testserver/foreignkeytarget/3/', 'name': 'target-3', 'sources': ['http://testserver/foreignkeysource/1/', 'http://testserver/foreignkeysource/3/']},
        ]
        self.assertEqual(serializer.data, expected)

    def test_foreign_key_update_with_invalid_null(self):
        data = {'url': 'http://testserver/foreignkeysource/1/', 'name': 'source-1', 'target': None}
        instance = ForeignKeySource.objects.get(pk=1)
        serializer = ForeignKeySourceSerializer(instance, data=data, context={'request': request})
        self.assertFalse(serializer.is_valid())
        self.assertEqual(serializer.errors, {'target': ['This field may not be null.']})


class HyperlinkedNullableForeignKeyTests(TestCase):
    urls = 'tests.test_relations_hyperlink'

    def setUp(self):
        target = ForeignKeyTarget(name='target-1')
        target.save()
        for idx in range(1, 4):
            if idx == 3:
                target = None
            source = NullableForeignKeySource(name='source-%d' % idx, target=target)
            source.save()

    def test_foreign_key_retrieve_with_null(self):
        queryset = NullableForeignKeySource.objects.all()
        serializer = NullableForeignKeySourceSerializer(queryset, many=True, context={'request': request})
        expected = [
            {'url': 'http://testserver/nullableforeignkeysource/1/', 'name': 'source-1', 'target': 'http://testserver/foreignkeytarget/1/'},
            {'url': 'http://testserver/nullableforeignkeysource/2/', 'name': 'source-2', 'target': 'http://testserver/foreignkeytarget/1/'},
            {'url': 'http://testserver/nullableforeignkeysource/3/', 'name': 'source-3', 'target': None},
        ]
        self.assertEqual(serializer.data, expected)

    def test_foreign_key_create_with_valid_null(self):
        data = {'url': 'http://testserver/nullableforeignkeysource/4/', 'name': 'source-4', 'target': None}
        serializer = NullableForeignKeySourceSerializer(data=data, context={'request': request})
        self.assertTrue(serializer.is_valid())
        obj = serializer.save()
        self.assertEqual(serializer.data, data)
        self.assertEqual(obj.name, 'source-4')

        # Ensure source 4 is created, and everything else is as expected
        queryset = NullableForeignKeySource.objects.all()
        serializer = NullableForeignKeySourceSerializer(queryset, many=True, context={'request': request})
        expected = [
            {'url': 'http://testserver/nullableforeignkeysource/1/', 'name': 'source-1', 'target': 'http://testserver/foreignkeytarget/1/'},
            {'url': 'http://testserver/nullableforeignkeysource/2/', 'name': 'source-2', 'target': 'http://testserver/foreignkeytarget/1/'},
            {'url': 'http://testserver/nullableforeignkeysource/3/', 'name': 'source-3', 'target': None},
            {'url': 'http://testserver/nullableforeignkeysource/4/', 'name': 'source-4', 'target': None}
        ]
        self.assertEqual(serializer.data, expected)

    def test_foreign_key_create_with_valid_emptystring(self):
        """
        The emptystring should be interpreted as null in the context
        of relationships.
        """
        data = {'url': 'http://testserver/nullableforeignkeysource/4/', 'name': 'source-4', 'target': ''}
        expected_data = {'url': 'http://testserver/nullableforeignkeysource/4/', 'name': 'source-4', 'target': None}
        serializer = NullableForeignKeySourceSerializer(data=data, context={'request': request})
        self.assertTrue(serializer.is_valid())
        obj = serializer.save()
        self.assertEqual(serializer.data, expected_data)
        self.assertEqual(obj.name, 'source-4')

        # Ensure source 4 is created, and everything else is as expected
        queryset = NullableForeignKeySource.objects.all()
        serializer = NullableForeignKeySourceSerializer(queryset, many=True, context={'request': request})
        expected = [
            {'url': 'http://testserver/nullableforeignkeysource/1/', 'name': 'source-1', 'target': 'http://testserver/foreignkeytarget/1/'},
            {'url': 'http://testserver/nullableforeignkeysource/2/', 'name': 'source-2', 'target': 'http://testserver/foreignkeytarget/1/'},
            {'url': 'http://testserver/nullableforeignkeysource/3/', 'name': 'source-3', 'target': None},
            {'url': 'http://testserver/nullableforeignkeysource/4/', 'name': 'source-4', 'target': None}
        ]
        self.assertEqual(serializer.data, expected)

    def test_foreign_key_update_with_valid_null(self):
        data = {'url': 'http://testserver/nullableforeignkeysource/1/', 'name': 'source-1', 'target': None}
        instance = NullableForeignKeySource.objects.get(pk=1)
        serializer = NullableForeignKeySourceSerializer(instance, data=data, context={'request': request})
        self.assertTrue(serializer.is_valid())
        serializer.save()
        self.assertEqual(serializer.data, data)

        # Ensure source 1 is updated, and everything else is as expected
        queryset = NullableForeignKeySource.objects.all()
        serializer = NullableForeignKeySourceSerializer(queryset, many=True, context={'request': request})
        expected = [
            {'url': 'http://testserver/nullableforeignkeysource/1/', 'name': 'source-1', 'target': None},
            {'url': 'http://testserver/nullableforeignkeysource/2/', 'name': 'source-2', 'target': 'http://testserver/foreignkeytarget/1/'},
            {'url': 'http://testserver/nullableforeignkeysource/3/', 'name': 'source-3', 'target': None},
        ]
        self.assertEqual(serializer.data, expected)

    def test_foreign_key_update_with_valid_emptystring(self):
        """
        The emptystring should be interpreted as null in the context
        of relationships.
        """
        data = {'url': 'http://testserver/nullableforeignkeysource/1/', 'name': 'source-1', 'target': ''}
        expected_data = {'url': 'http://testserver/nullableforeignkeysource/1/', 'name': 'source-1', 'target': None}
        instance = NullableForeignKeySource.objects.get(pk=1)
        serializer = NullableForeignKeySourceSerializer(instance, data=data, context={'request': request})
        self.assertTrue(serializer.is_valid())
        serializer.save()
        self.assertEqual(serializer.data, expected_data)

        # Ensure source 1 is updated, and everything else is as expected
        queryset = NullableForeignKeySource.objects.all()
        serializer = NullableForeignKeySourceSerializer(queryset, many=True, context={'request': request})
        expected = [
            {'url': 'http://testserver/nullableforeignkeysource/1/', 'name': 'source-1', 'target': None},
            {'url': 'http://testserver/nullableforeignkeysource/2/', 'name': 'source-2', 'target': 'http://testserver/foreignkeytarget/1/'},
            {'url': 'http://testserver/nullableforeignkeysource/3/', 'name': 'source-3', 'target': None},
        ]
        self.assertEqual(serializer.data, expected)

#     # reverse foreign keys MUST be read_only
#     # In the general case they do not provide .remove() or .clear()
#     # and cannot be arbitrarily set.

    # def test_reverse_foreign_key_update(self):
    #     data = {'id': 1, 'name': 'target-1', 'sources': [1]}
    #     instance = ForeignKeyTarget.objects.get(pk=1)
    #     serializer = ForeignKeyTargetSerializer(instance, data=data)
    #     print serializer.is_valid()
    #     print serializer.errors
    #     print serializer
    #     self.assertTrue(serializer.is_valid())
    #     serializer.save()
    #     self.assertEqual(serializer.data, data)

    #     # Ensure target 1 is updated, and everything else is as expected
    #     queryset = ForeignKeyTarget.objects.all()
    #     serializer = ForeignKeyTargetSerializer(queryset, many=True)
    #     expected = [
    #         {'id': 1, 'name': 'target-1', 'sources': [1]},
    #         {'id': 2, 'name': 'target-2', 'sources': []},
    #     ]
    #     self.assertEqual(serializer.data, expected)


class HyperlinkedNullableOneToOneTests(TestCase):
    urls = 'tests.test_relations_hyperlink'

    def setUp(self):
        target = OneToOneTarget(name='target-1')
        target.save()
        new_target = OneToOneTarget(name='target-2')
        new_target.save()
        source = NullableOneToOneSource(name='source-1', target=target)
        source.save()

    def test_reverse_foreign_key_retrieve_with_null(self):
        queryset = OneToOneTarget.objects.all()
        serializer = NullableOneToOneTargetSerializer(queryset, many=True, context={'request': request})
        expected = [
            {'url': 'http://testserver/onetoonetarget/1/', 'name': 'target-1', 'nullable_source': 'http://testserver/nullableonetoonesource/1/'},
            {'url': 'http://testserver/onetoonetarget/2/', 'name': 'target-2', 'nullable_source': None},
        ]
        self.assertEqual(serializer.data, expected)


# # Regression tests for #694 (`source` attribute on related fields)

# class HyperlinkedRelatedFieldSourceTests(TestCase):
#     urls = 'tests.test_relations_hyperlink'

#     def test_related_manager_source(self):
#         """
#         Relational fields should be able to use manager-returning methods as their source.
#         """
#         BlogPost.objects.create(title='blah')
#         field = serializers.HyperlinkedRelatedField(
#             many=True,
#             source='get_blogposts_manager',
#             view_name='dummy-url',
#         )
#         field.context = {'request': request}

#         class ClassWithManagerMethod(object):
#             def get_blogposts_manager(self):
#                 return BlogPost.objects

#         obj = ClassWithManagerMethod()
#         value = field.field_to_native(obj, 'field_name')
#         self.assertEqual(value, ['http://testserver/dummyurl/1/'])

#     def test_related_queryset_source(self):
#         """
#         Relational fields should be able to use queryset-returning methods as their source.
#         """
#         BlogPost.objects.create(title='blah')
#         field = serializers.HyperlinkedRelatedField(
#             many=True,
#             source='get_blogposts_queryset',
#             view_name='dummy-url',
#         )
#         field.context = {'request': request}

#         class ClassWithQuerysetMethod(object):
#             def get_blogposts_queryset(self):
#                 return BlogPost.objects.all()

#         obj = ClassWithQuerysetMethod()
#         value = field.field_to_native(obj, 'field_name')
#         self.assertEqual(value, ['http://testserver/dummyurl/1/'])

#     def test_dotted_source(self):
#         """
#         Source argument should support dotted.source notation.
#         """
#         BlogPost.objects.create(title='blah')
#         field = serializers.HyperlinkedRelatedField(
#             many=True,
#             source='a.b.c',
#             view_name='dummy-url',
#         )
#         field.context = {'request': request}

#         class ClassWithQuerysetMethod(object):
#             a = {
#                 'b': {
#                     'c': BlogPost.objects.all()
#                 }
#             }

#         obj = ClassWithQuerysetMethod()
#         value = field.field_to_native(obj, 'field_name')
#         self.assertEqual(value, ['http://testserver/dummyurl/1/'])