one 2 one nested relationships

3 files changed, 441 insertions, 105 deletions

diff --git a/rest_framework/serializers.py b/rest_framework/serializers.py
index 4fe857a6..f073e00a 100644
--- a/rest_framework/serializers.py
+++ b/rest_framework/serializers.py
@@ -20,6 +20,25 @@ from rest_framework.relations import *
 from rest_framework.fields import *
 
 
+class NestedValidationError(ValidationError):
+    """
+    The default ValidationError behavior is to stringify each item in the list
+    if the messages are a list of error messages.
+
+    In the case of nested serializers, where the parent has many children,
+    then the child's `serializer.errors` will be a list of dicts.  In the case
+    of a single child, the `serializer.errors` will be a dict.
+
+    We need to override the default behavior to get properly nested error dicts.
+    """
+
+    def __init__(self, message):
+        if isinstance(message, dict):
+            self.messages = [message]
+        else:
+            self.messages = message
+
+
 class DictWithMetadata(dict):
     """
     A dict-like object, that can have additional properties attached.
@@ -98,7 +117,7 @@ class SerializerOptions(object):
         self.exclude = getattr(meta, 'exclude', ())
 
 
-class BaseSerializer(Field):
+class BaseSerializer(WritableField):
     """
     This is the Serializer implementation.
     We need to implement it as `BaseSerializer` due to metaclass magicks.
@@ -128,6 +147,7 @@ class BaseSerializer(Field):
         self._data = None
         self._files = None
         self._errors = None
+        self._delete = False
 
     #####
     # Methods to determine which fields to use when (de)serializing objects.
@@ -296,40 +316,77 @@ class BaseSerializer(Field):
 
     def field_to_native(self, obj, field_name):
         """
-        Override default so that we can apply ModelSerializer as a nested
-        field to relationships.
+        Override default so that the serializer can be used as a nested field
+        across relationships.
         """
         if self.source == '*':
             return self.to_native(obj)
 
         try:
-            if self.source:
-                for component in self.source.split('.'):
-                    obj = getattr(obj, component)
-                    if is_simple_callable(obj):
-                        obj = obj()
-            else:
-                obj = getattr(obj, field_name)
-                if is_simple_callable(obj):
-                    obj = obj()
+            source = self.source or field_name
+            value = obj
+
+            for component in source.split('.'):
+                value = get_component(value, component)
+                if value is None:
+                    break
         except ObjectDoesNotExist:
             return None
 
-        # If the object has an "all" method, assume it's a relationship
-        if is_simple_callable(getattr(obj, 'all', None)):
-            return [self.to_native(item) for item in obj.all()]
+        if is_simple_callable(getattr(value, 'all', None)):
+            return [self.to_native(item) for item in value.all()]
 
-        if obj is None:
+        if value is None:
             return None
 
         if self.many is not None:
             many = self.many
         else:
-            many = hasattr(obj, '__iter__') and not isinstance(obj, (Page, dict, six.text_type))
+            many = hasattr(value, '__iter__') and not isinstance(value, (Page, dict, six.text_type))
 
         if many:
-            return [self.to_native(item) for item in obj]
-        return self.to_native(obj)
+            return [self.to_native(item) for item in value]
+        return self.to_native(value)
+
+    def field_from_native(self, data, files, field_name, into):
+        """
+        Override default so that the serializer can be used as a writable
+        nested field across relationships.
+        """
+        if self.read_only:
+            return
+
+        try:
+            value = data[field_name]
+        except KeyError:
+            if self.required:
+                raise ValidationError(self.error_messages['required'])
+            return
+
+        # Set the serializer object if it exists
+        obj = getattr(self.parent.object, field_name) if self.parent.object else None
+
+        if value in (None, ''):
+            into[(self.source or field_name)] = None
+        else:
+            kwargs = {
+                'instance': obj,
+                'data': value,
+                'context': self.context,
+                'partial': self.partial,
+                'many': self.many
+            }
+            serializer = self.__class__(**kwargs)
+
+            if serializer.is_valid():
+                if isinstance(serializer, ModelSerializer):
+                    into[self.source or field_name] = serializer
+                else:
+                    into[self.source or field_name] = serializer.object
+                # into[self.source or field_name] = serializer.object
+            else:
+                # Propagate errors up to our parent
+                raise NestedValidationError(serializer.errors)
 
     @property
     def errors(self):
@@ -584,25 +641,25 @@ class ModelSerializer(Serializer):
         """
         Restore the model instance.
         """
-        self.m2m_data = {}
-        self.related_data = {}
+        m2m_data = {}
+        related_data = {}
 
         # Reverse fk relations
         for (obj, model) in self.opts.model._meta.get_all_related_objects_with_model():
             field_name = obj.field.related_query_name()
             if field_name in attrs:
-                self.related_data[field_name] = attrs.pop(field_name)
+                related_data[field_name] = attrs.pop(field_name)
 
         # Reverse m2m relations
         for (obj, model) in self.opts.model._meta.get_all_related_m2m_objects_with_model():
             field_name = obj.field.related_query_name()
             if field_name in attrs:
-                self.m2m_data[field_name] = attrs.pop(field_name)
+                m2m_data[field_name] = attrs.pop(field_name)
 
         # Forward m2m relations
         for field in self.opts.model._meta.many_to_many:
             if field.name in attrs:
-                self.m2m_data[field.name] = attrs.pop(field.name)
+                m2m_data[field.name] = attrs.pop(field.name)
 
         if instance is not None:
             for key, val in attrs.items():
@@ -611,6 +668,9 @@ class ModelSerializer(Serializer):
         else:
             instance = self.opts.model(**attrs)
 
+        instance._related_data = related_data
+        instance._m2m_data = m2m_data
+
         return instance
 
     def from_native(self, data, files):
@@ -621,21 +681,41 @@ class ModelSerializer(Serializer):
         if instance:
             return self.full_clean(instance)
 
-    def save_object(self, obj, **kwargs):
+#     def save_object(self, obj, **kwargs):
+#         """
+#         Save the deserialized object and return it.
+#         """
+#         obj.save(**kwargs)
+# =======
+    def save_object(self, obj, parent=None, fk_field=None, **kwargs):
         """
         Save the deserialized object and return it.
         """
-        obj.save(**kwargs)
+        if parent and fk_field:
+            setattr(self.object, fk_field, parent)
 
-        if getattr(self, 'm2m_data', None):
-            for accessor_name, object_list in self.m2m_data.items():
-                setattr(self.object, accessor_name, object_list)
-            self.m2m_data = {}
+        obj.save(**kwargs)
 
-        if getattr(self, 'related_data', None):
-            for accessor_name, object_list in self.related_data.items():
+        if getattr(obj, '_m2m_data', None):
+            for accessor_name, object_list in obj._m2m_data.items():
                 setattr(self.object, accessor_name, object_list)
-            self.related_data = {}
+            obj._m2m_data = {}
+
+        if getattr(obj, '_related_data', None):
+            for accessor_name, related in obj._related_data.items():
+                if related is None:
+                    previous = getattr(self.object, accessor_name, related)
+                    previous.delete()
+                elif isinstance(related, ModelSerializer):
+                    # print related.object
+                    # print related.related_data, related.m2m_data
+                    fk_field = obj._meta.get_field_by_name(accessor_name)[0].field.name
+                    related.save_object(related.object, parent=self.object, fk_field=fk_field)
+                    # setattr(related, fk_field, obj)
+                    # related.save(**kwargs)
+                else:
+                    setattr(self.object, accessor_name, related)
+            obj._related_data = {}
 
 
 class HyperlinkedModelSerializerOptions(ModelSerializerOptions):
diff --git a/rest_framework/tests/relations_nested.py b/rest_framework/tests/relations_nested.py
index a125ba65..4592e559 100644
--- a/rest_framework/tests/relations_nested.py
+++ b/rest_framework/tests/relations_nested.py
@@ -1,115 +1,125 @@
 from __future__ import unicode_literals
+from django.db import models
 from django.test import TestCase
 from rest_framework import serializers
-from rest_framework.tests.models import ForeignKeyTarget, ForeignKeySource, NullableForeignKeySource, OneToOneTarget, NullableOneToOneSource
 
 
-class ForeignKeySourceSerializer(serializers.ModelSerializer):
-    class Meta:
-        depth = 1
-        model = ForeignKeySource
-
+class OneToOneTarget(models.Model):
+    name = models.CharField(max_length=100)
 
-class FlatForeignKeySourceSerializer(serializers.ModelSerializer):
-    class Meta:
-        model = ForeignKeySource
 
+class OneToOneTargetSource(models.Model):
+    name = models.CharField(max_length=100)
+    target = models.OneToOneField(OneToOneTarget, null=True, blank=True,
+                                  related_name='target_source')
 
-class ForeignKeyTargetSerializer(serializers.ModelSerializer):
-    sources = FlatForeignKeySourceSerializer(many=True)
 
-    class Meta:
-        model = ForeignKeyTarget
+class OneToOneSource(models.Model):
+    name = models.CharField(max_length=100)
+    target_source = models.OneToOneField(OneToOneTargetSource, related_name='source')
 
 
-class NullableForeignKeySourceSerializer(serializers.ModelSerializer):
+class OneToOneSourceSerializer(serializers.ModelSerializer):
     class Meta:
-        depth = 1
-        model = NullableForeignKeySource
+        model = OneToOneSource
+        exclude = ('target_source', )
 
 
-class NullableOneToOneSourceSerializer(serializers.ModelSerializer):
+class OneToOneTargetSourceSerializer(serializers.ModelSerializer):
+    source = OneToOneSourceSerializer()
+
     class Meta:
-        model = NullableOneToOneSource
+        model = OneToOneTargetSource
+        exclude = ('target', )
 
 
-class NullableOneToOneTargetSerializer(serializers.ModelSerializer):
-    nullable_source = NullableOneToOneSourceSerializer()
+class OneToOneTargetSerializer(serializers.ModelSerializer):
+    target_source = OneToOneTargetSourceSerializer()
 
     class Meta:
         model = OneToOneTarget
 
 
-class ReverseForeignKeyTests(TestCase):
+class NestedOneToOneTests(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)
+            target = OneToOneTarget(name='target-%d' % idx)
+            target.save()
+            target_source = OneToOneTargetSource(name='target-source-%d' % idx, target=target)
+            target_source.save()
+            source = OneToOneSource(name='source-%d' % idx, target_source=target_source)
             source.save()
 
-    def test_foreign_key_retrieve(self):
-        queryset = ForeignKeySource.objects.all()
-        serializer = ForeignKeySourceSerializer(queryset, many=True)
+    def test_one_to_one_retrieve(self):
+        queryset = OneToOneTarget.objects.all()
+        serializer = OneToOneTargetSerializer(queryset)
         expected = [
-            {'id': 1, 'name': 'source-1', 'target': {'id': 1, 'name': 'target-1'}},
-            {'id': 2, 'name': 'source-2', 'target': {'id': 1, 'name': 'target-1'}},
-            {'id': 3, 'name': 'source-3', 'target': {'id': 1, 'name': 'target-1'}},
+            {'id': 1, 'name': 'target-1', 'target_source': {'id': 1, 'name': 'target-source-1', 'source': {'id': 1, 'name': 'source-1'}}},
+            {'id': 2, 'name': 'target-2', 'target_source': {'id': 2, 'name': 'target-source-2', 'source': {'id': 2, 'name': 'source-2'}}},
+            {'id': 3, 'name': 'target-3', 'target_source': {'id': 3, 'name': 'target-source-3', 'source': {'id': 3, 'name': 'source-3'}}}
         ]
         self.assertEqual(serializer.data, expected)
 
-    def test_reverse_foreign_key_retrieve(self):
-        queryset = ForeignKeyTarget.objects.all()
-        serializer = ForeignKeyTargetSerializer(queryset, many=True)
+    def test_one_to_one_create(self):
+        data = {'id': 4, 'name': 'target-4', 'target_source': {'id': 4, 'name': 'target-source-4', 'source': {'id': 4, 'name': 'source-4'}}}
+        serializer = OneToOneTargetSerializer(data=data)
+        self.assertTrue(serializer.is_valid())
+        obj = serializer.save()
+        self.assertEqual(serializer.data, data)
+        self.assertEqual(obj.name, 'target-4')
+
+        # Ensure (target 4, target_source 4, source 4) are added, and
+        # everything else is as expected.
+        queryset = OneToOneTarget.objects.all()
+        serializer = OneToOneTargetSerializer(queryset)
         expected = [
-            {'id': 1, 'name': 'target-1', 'sources': [
-                {'id': 1, 'name': 'source-1', 'target': 1},
-                {'id': 2, 'name': 'source-2', 'target': 1},
-                {'id': 3, 'name': 'source-3', 'target': 1},
-            ]},
-            {'id': 2, 'name': 'target-2', 'sources': [
-            ]}
+            {'id': 1, 'name': 'target-1', 'target_source': {'id': 1, 'name': 'target-source-1', 'source': {'id': 1, 'name': 'source-1'}}},
+            {'id': 2, 'name': 'target-2', 'target_source': {'id': 2, 'name': 'target-source-2', 'source': {'id': 2, 'name': 'source-2'}}},
+            {'id': 3, 'name': 'target-3', 'target_source': {'id': 3, 'name': 'target-source-3', 'source': {'id': 3, 'name': 'source-3'}}},
+            {'id': 4, 'name': 'target-4', 'target_source': {'id': 4, 'name': 'target-source-4', 'source': {'id': 4, 'name': 'source-4'}}}
         ]
         self.assertEqual(serializer.data, expected)
 
-
-class NestedNullableForeignKeyTests(TestCase):
-    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)
+    def test_one_to_one_create_with_invalid_data(self):
+        data = {'id': 4, 'name': 'target-4', 'target_source': {'id': 4, 'name': 'target-source-4', 'source': {'id': 4}}}
+        serializer = OneToOneTargetSerializer(data=data)
+        self.assertFalse(serializer.is_valid())
+        self.assertEqual(serializer.errors, {'target_source': [{'source': [{'name': ['This field is required.']}]}]})
+
+    def test_one_to_one_update(self):
+        data = {'id': 3, 'name': 'target-3-updated', 'target_source': {'id': 3, 'name': 'target-source-3-updated', 'source': {'id': 3, 'name': 'source-3-updated'}}}
+        instance = OneToOneTarget.objects.get(pk=3)
+        serializer = OneToOneTargetSerializer(instance, data=data)
+        self.assertTrue(serializer.is_valid())
+        obj = serializer.save()
+        self.assertEqual(serializer.data, data)
+        self.assertEqual(obj.name, 'target-3-updated')
+
+        # Ensure (target 3, target_source 3, source 3) are updated,
+        # and everything else is as expected.
+        queryset = OneToOneTarget.objects.all()
+        serializer = OneToOneTargetSerializer(queryset)
         expected = [
-            {'id': 1, 'name': 'source-1', 'target': {'id': 1, 'name': 'target-1'}},
-            {'id': 2, 'name': 'source-2', 'target': {'id': 1, 'name': 'target-1'}},
-            {'id': 3, 'name': 'source-3', 'target': None},
+            {'id': 1, 'name': 'target-1', 'target_source': {'id': 1, 'name': 'target-source-1', 'source': {'id': 1, 'name': 'source-1'}}},
+            {'id': 2, 'name': 'target-2', 'target_source': {'id': 2, 'name': 'target-source-2', 'source': {'id': 2, 'name': 'source-2'}}},
+            {'id': 3, 'name': 'target-3-updated', 'target_source': {'id': 3, 'name': 'target-source-3-updated', 'source': {'id': 3, 'name': 'source-3-updated'}}}
         ]
         self.assertEqual(serializer.data, expected)
 
+    def test_one_to_one_delete(self):
+        data = {'id': 3, 'name': 'target-3', 'target_source': None}
+        instance = OneToOneTarget.objects.get(pk=3)
+        serializer = OneToOneTargetSerializer(instance, data=data)
+        self.assertTrue(serializer.is_valid())
+        serializer.save()
 
-class NestedNullableOneToOneTests(TestCase):
-    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):
+        # Ensure (target_source 3, source 3) are deleted,
+        # and everything else is as expected.
         queryset = OneToOneTarget.objects.all()
-        serializer = NullableOneToOneTargetSerializer(queryset, many=True)
+        serializer = OneToOneTargetSerializer(queryset)
         expected = [
-            {'id': 1, 'name': 'target-1', 'nullable_source': {'id': 1, 'name': 'source-1', 'target': 1}},
-            {'id': 2, 'name': 'target-2', 'nullable_source': None},
+            {'id': 1, 'name': 'target-1', 'target_source': {'id': 1, 'name': 'target-source-1', 'source': {'id': 1, 'name': 'source-1'}}},
+            {'id': 2, 'name': 'target-2', 'target_source': {'id': 2, 'name': 'target-source-2', 'source': {'id': 2, 'name': 'source-2'}}},
+            {'id': 3, 'name': 'target-3', 'target_source': None}
         ]
         self.assertEqual(serializer.data, expected)
diff --git a/rest_framework/tests/serializer_nested.py b/rest_framework/tests/serializer_nested.py
new file mode 100644
index 00000000..6a29c652
--- /dev/null
+++ b/rest_framework/tests/serializer_nested.py
@@ -0,0 +1,246 @@
+"""
+Tests to cover nested serializers.
+
+Doesn't cover model serializers.
+"""
+from __future__ import unicode_literals
+from django.test import TestCase
+from rest_framework import serializers
+
+
+class WritableNestedSerializerBasicTests(TestCase):
+    """
+    Tests for deserializing nested entities.
+    Basic tests that use serializers that simply restore to dicts.
+    """
+
+    def setUp(self):
+        class TrackSerializer(serializers.Serializer):
+            order = serializers.IntegerField()
+            title = serializers.CharField(max_length=100)
+            duration = serializers.IntegerField()
+
+        class AlbumSerializer(serializers.Serializer):
+            album_name = serializers.CharField(max_length=100)
+            artist = serializers.CharField(max_length=100)
+            tracks = TrackSerializer(many=True)
+
+        self.AlbumSerializer = AlbumSerializer
+
+    def test_nested_validation_success(self):
+        """
+        Correct nested serialization should return the input data.
+        """
+
+        data = {
+            'album_name': 'Discovery',
+            'artist': 'Daft Punk',
+            'tracks': [
+                {'order': 1, 'title': 'One More Time', 'duration': 235},
+                {'order': 2, 'title': 'Aerodynamic', 'duration': 184},
+                {'order': 3, 'title': 'Digital Love', 'duration': 239}
+            ]
+        }
+
+        serializer = self.AlbumSerializer(data=data)
+        self.assertEqual(serializer.is_valid(), True)
+        self.assertEqual(serializer.object, data)
+
+    def test_nested_validation_error(self):
+        """
+        Incorrect nested serialization should return appropriate error data.
+        """
+
+        data = {
+            'album_name': 'Discovery',
+            'artist': 'Daft Punk',
+            'tracks': [
+                {'order': 1, 'title': 'One More Time', 'duration': 235},
+                {'order': 2, 'title': 'Aerodynamic', 'duration': 184},
+                {'order': 3, 'title': 'Digital Love', 'duration': 'foobar'}
+            ]
+        }
+        expected_errors = {
+            'tracks': [
+                {},
+                {},
+                {'duration': ['Enter a whole number.']}
+            ]
+        }
+
+        serializer = self.AlbumSerializer(data=data)
+        self.assertEqual(serializer.is_valid(), False)
+        self.assertEqual(serializer.errors, expected_errors)
+
+    def test_many_nested_validation_error(self):
+        """
+        Incorrect nested serialization should return appropriate error data
+        when multiple entities are being deserialized.
+        """
+
+        data = [
+            {
+                'album_name': 'Russian Red',
+                'artist': 'I Love Your Glasses',
+                'tracks': [
+                    {'order': 1, 'title': 'Cigarettes', 'duration': 121},
+                    {'order': 2, 'title': 'No Past Land', 'duration': 198},
+                    {'order': 3, 'title': 'They Don\'t Believe', 'duration': 191}
+                ]
+            },
+            {
+                'album_name': 'Discovery',
+                'artist': 'Daft Punk',
+                'tracks': [
+                    {'order': 1, 'title': 'One More Time', 'duration': 235},
+                    {'order': 2, 'title': 'Aerodynamic', 'duration': 184},
+                    {'order': 3, 'title': 'Digital Love', 'duration': 'foobar'}
+                ]
+            }
+        ]
+        expected_errors = [
+            {},
+            {
+                'tracks': [
+                    {},
+                    {},
+                    {'duration': ['Enter a whole number.']}
+                ]
+            }
+        ]
+
+        serializer = self.AlbumSerializer(data=data)
+        self.assertEqual(serializer.is_valid(), False)
+        self.assertEqual(serializer.errors, expected_errors)
+
+
+class WritableNestedSerializerObjectTests(TestCase):
+    """
+    Tests for deserializing nested entities.
+    These tests use serializers that restore to concrete objects.
+    """
+
+    def setUp(self):
+        # Couple of concrete objects that we're going to deserialize into
+        class Track(object):
+            def __init__(self, order, title, duration):
+                self.order, self.title, self.duration = order, title, duration
+
+            def __eq__(self, other):
+                return (
+                    self.order == other.order and
+                    self.title == other.title and
+                    self.duration == other.duration
+                )
+
+        class Album(object):
+            def __init__(self, album_name, artist, tracks):
+                self.album_name, self.artist, self.tracks = album_name, artist, tracks
+
+            def __eq__(self, other):
+                return (
+                    self.album_name == other.album_name and
+                    self.artist == other.artist and
+                    self.tracks == other.tracks
+                )
+
+        # And their corresponding serializers
+        class TrackSerializer(serializers.Serializer):
+            order = serializers.IntegerField()
+            title = serializers.CharField(max_length=100)
+            duration = serializers.IntegerField()
+
+            def restore_object(self, attrs, instance=None):
+                return Track(attrs['order'], attrs['title'], attrs['duration'])
+
+        class AlbumSerializer(serializers.Serializer):
+            album_name = serializers.CharField(max_length=100)
+            artist = serializers.CharField(max_length=100)
+            tracks = TrackSerializer(many=True)
+
+            def restore_object(self, attrs, instance=None):
+                return Album(attrs['album_name'], attrs['artist'], attrs['tracks'])
+
+        self.Album, self.Track = Album, Track
+        self.AlbumSerializer = AlbumSerializer
+
+    def test_nested_validation_success(self):
+        """
+        Correct nested serialization should return a restored object
+        that corresponds to the input data.
+        """
+
+        data = {
+            'album_name': 'Discovery',
+            'artist': 'Daft Punk',
+            'tracks': [
+                {'order': 1, 'title': 'One More Time', 'duration': 235},
+                {'order': 2, 'title': 'Aerodynamic', 'duration': 184},
+                {'order': 3, 'title': 'Digital Love', 'duration': 239}
+            ]
+        }
+        expected_object = self.Album(
+            album_name='Discovery',
+            artist='Daft Punk',
+            tracks=[
+                self.Track(order=1, title='One More Time', duration=235),
+                self.Track(order=2, title='Aerodynamic', duration=184),
+                self.Track(order=3, title='Digital Love', duration=239),
+            ]
+        )
+
+        serializer = self.AlbumSerializer(data=data)
+        self.assertEqual(serializer.is_valid(), True)
+        self.assertEqual(serializer.object, expected_object)
+
+    def test_many_nested_validation_success(self):
+        """
+        Correct nested serialization should return multiple restored objects
+        that corresponds to the input data when multiple objects are
+        being deserialized.
+        """
+
+        data = [
+            {
+                'album_name': 'Russian Red',
+                'artist': 'I Love Your Glasses',
+                'tracks': [
+                    {'order': 1, 'title': 'Cigarettes', 'duration': 121},
+                    {'order': 2, 'title': 'No Past Land', 'duration': 198},
+                    {'order': 3, 'title': 'They Don\'t Believe', 'duration': 191}
+                ]
+            },
+            {
+                'album_name': 'Discovery',
+                'artist': 'Daft Punk',
+                'tracks': [
+                    {'order': 1, 'title': 'One More Time', 'duration': 235},
+                    {'order': 2, 'title': 'Aerodynamic', 'duration': 184},
+                    {'order': 3, 'title': 'Digital Love', 'duration': 239}
+                ]
+            }
+        ]
+        expected_object = [
+            self.Album(
+                album_name='Russian Red',
+                artist='I Love Your Glasses',
+                tracks=[
+                    self.Track(order=1, title='Cigarettes', duration=121),
+                    self.Track(order=2, title='No Past Land', duration=198),
+                    self.Track(order=3, title='They Don\'t Believe', duration=191),
+                ]
+            ),
+            self.Album(
+                album_name='Discovery',
+                artist='Daft Punk',
+                tracks=[
+                    self.Track(order=1, title='One More Time', duration=235),
+                    self.Track(order=2, title='Aerodynamic', duration=184),
+                    self.Track(order=3, title='Digital Love', duration=239),
+                ]
+            )
+        ]
+
+        serializer = self.AlbumSerializer(data=data)
+        self.assertEqual(serializer.is_valid(), True)
+        self.assertEqual(serializer.object, expected_object)