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One-to-one writable, nested serializer support
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@ -26,13 +26,17 @@ class NestedValidationError(ValidationError):
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if the messages are a list of error messages.
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In the case of nested serializers, where the parent has many children,
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then the child's `serializer.errors` will be a list of dicts.
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then the child's `serializer.errors` will be a list of dicts. In the case
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of a single child, the `serializer.errors` will be a dict.
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We need to override the default behavior to get properly nested error dicts.
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"""
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def __init__(self, message):
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self.messages = message
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if isinstance(message, dict):
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self.messages = [message]
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else:
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self.messages = message
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class DictWithMetadata(dict):
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@ -143,6 +147,7 @@ class BaseSerializer(WritableField):
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self._data = None
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self._files = None
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self._errors = None
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self._delete = False
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#####
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# Methods to determine which fields to use when (de)serializing objects.
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@ -354,15 +359,19 @@ class BaseSerializer(WritableField):
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raise ValidationError(self.error_messages['required'])
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return
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if self.parent.object:
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# Set the serializer object if it exists
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obj = getattr(self.parent.object, field_name)
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self.object = obj
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# Set the serializer object if it exists
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obj = getattr(self.parent.object, field_name) if self.parent.object else None
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if value in (None, ''):
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into[(self.source or field_name)] = None
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if isinstance(self, ModelSerializer):
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self._delete = True
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self.object = obj
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into[(self.source or field_name)] = self
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else:
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into[(self.source or field_name)] = None
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else:
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kwargs = {
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'instance': obj,
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'data': value,
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'context': self.context,
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'partial': self.partial,
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@ -371,8 +380,10 @@ class BaseSerializer(WritableField):
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serializer = self.__class__(**kwargs)
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if serializer.is_valid():
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self.object = serializer.object
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into[self.source or field_name] = serializer.object
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if isinstance(serializer, ModelSerializer):
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into[self.source or field_name] = serializer
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else:
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into[self.source or field_name] = serializer.object
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else:
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# Propagate errors up to our parent
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raise NestedValidationError(serializer.errors)
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@ -664,10 +675,17 @@ class ModelSerializer(Serializer):
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if instance:
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return self.full_clean(instance)
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def save_object(self, obj):
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def save_object(self, obj, parent=None, fk_field=None):
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"""
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Save the deserialized object and return it.
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"""
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if self._delete:
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obj.delete()
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return
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if parent and fk_field:
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setattr(self.object, fk_field, parent)
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obj.save()
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if getattr(self, 'm2m_data', None):
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@ -677,7 +695,11 @@ class ModelSerializer(Serializer):
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if getattr(self, 'related_data', None):
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for accessor_name, object_list in self.related_data.items():
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setattr(self.object, accessor_name, object_list)
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if isinstance(object_list, ModelSerializer):
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fk_field = self.object._meta.get_field_by_name(accessor_name)[0].field.name
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object_list.save_object(object_list.object, parent=self.object, fk_field=fk_field)
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else:
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setattr(self.object, accessor_name, object_list)
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self.related_data = {}
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125
rest_framework/tests/nesting.py
Normal file
125
rest_framework/tests/nesting.py
Normal file
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@ -0,0 +1,125 @@
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from __future__ import unicode_literals
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from django.db import models
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from django.test import TestCase
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from rest_framework import serializers
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class OneToOneTarget(models.Model):
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name = models.CharField(max_length=100)
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class OneToOneTargetSource(models.Model):
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name = models.CharField(max_length=100)
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target = models.OneToOneField(OneToOneTarget, null=True, blank=True,
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related_name='target_source')
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class OneToOneSource(models.Model):
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name = models.CharField(max_length=100)
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target_source = models.OneToOneField(OneToOneTargetSource, related_name='source')
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class OneToOneSourceSerializer(serializers.ModelSerializer):
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class Meta:
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model = OneToOneSource
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exclude = ('target_source', )
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class OneToOneTargetSourceSerializer(serializers.ModelSerializer):
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source = OneToOneSourceSerializer()
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class Meta:
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model = OneToOneTargetSource
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exclude = ('target', )
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class OneToOneTargetSerializer(serializers.ModelSerializer):
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target_source = OneToOneTargetSourceSerializer()
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class Meta:
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model = OneToOneTarget
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class NestedOneToOneTests(TestCase):
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def setUp(self):
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for idx in range(1, 4):
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target = OneToOneTarget(name='target-%d' % idx)
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target.save()
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target_source = OneToOneTargetSource(name='target-source-%d' % idx, target=target)
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target_source.save()
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source = OneToOneSource(name='source-%d' % idx, target_source=target_source)
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source.save()
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def test_one_to_one_retrieve(self):
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queryset = OneToOneTarget.objects.all()
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serializer = OneToOneTargetSerializer(queryset)
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expected = [
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{'id': 1, 'name': 'target-1', 'target_source': {'id': 1, 'name': 'target-source-1', 'source': {'id': 1, 'name': 'source-1'}}},
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{'id': 2, 'name': 'target-2', 'target_source': {'id': 2, 'name': 'target-source-2', 'source': {'id': 2, 'name': 'source-2'}}},
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{'id': 3, 'name': 'target-3', 'target_source': {'id': 3, 'name': 'target-source-3', 'source': {'id': 3, 'name': 'source-3'}}}
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]
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self.assertEqual(serializer.data, expected)
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def test_one_to_one_create(self):
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data = {'id': 4, 'name': 'target-4', 'target_source': {'id': 4, 'name': 'target-source-4', 'source': {'id': 4, 'name': 'source-4'}}}
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serializer = OneToOneTargetSerializer(data=data)
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self.assertTrue(serializer.is_valid())
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obj = serializer.save()
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self.assertEqual(serializer.data, data)
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self.assertEqual(obj.name, 'target-4')
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# Ensure (target 4, target_source 4, source 4) are added, and
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# everything else is as expected.
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queryset = OneToOneTarget.objects.all()
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serializer = OneToOneTargetSerializer(queryset)
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expected = [
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{'id': 1, 'name': 'target-1', 'target_source': {'id': 1, 'name': 'target-source-1', 'source': {'id': 1, 'name': 'source-1'}}},
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{'id': 2, 'name': 'target-2', 'target_source': {'id': 2, 'name': 'target-source-2', 'source': {'id': 2, 'name': 'source-2'}}},
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{'id': 3, 'name': 'target-3', 'target_source': {'id': 3, 'name': 'target-source-3', 'source': {'id': 3, 'name': 'source-3'}}},
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{'id': 4, 'name': 'target-4', 'target_source': {'id': 4, 'name': 'target-source-4', 'source': {'id': 4, 'name': 'source-4'}}}
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]
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self.assertEqual(serializer.data, expected)
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def test_one_to_one_create_with_invalid_data(self):
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data = {'id': 4, 'name': 'target-4', 'target_source': {'id': 4, 'name': 'target-source-4', 'source': {'id': 4}}}
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serializer = OneToOneTargetSerializer(data=data)
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self.assertFalse(serializer.is_valid())
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self.assertEqual(serializer.errors, {'target_source': [{'source': [{'name': ['This field is required.']}]}]})
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def test_one_to_one_update(self):
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data = {'id': 3, 'name': 'target-3-updated', 'target_source': {'id': 3, 'name': 'target-source-3-updated', 'source': {'id': 3, 'name': 'source-3-updated'}}}
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instance = OneToOneTarget.objects.get(pk=3)
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serializer = OneToOneTargetSerializer(instance, data=data)
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self.assertTrue(serializer.is_valid())
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obj = serializer.save()
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self.assertEqual(serializer.data, data)
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self.assertEqual(obj.name, 'target-3-updated')
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# Ensure (target 3, target_source 3, source 3) are updated,
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# and everything else is as expected.
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queryset = OneToOneTarget.objects.all()
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serializer = OneToOneTargetSerializer(queryset)
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expected = [
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{'id': 1, 'name': 'target-1', 'target_source': {'id': 1, 'name': 'target-source-1', 'source': {'id': 1, 'name': 'source-1'}}},
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{'id': 2, 'name': 'target-2', 'target_source': {'id': 2, 'name': 'target-source-2', 'source': {'id': 2, 'name': 'source-2'}}},
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{'id': 3, 'name': 'target-3-updated', 'target_source': {'id': 3, 'name': 'target-source-3-updated', 'source': {'id': 3, 'name': 'source-3-updated'}}}
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]
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self.assertEqual(serializer.data, expected)
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def test_one_to_one_delete(self):
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data = {'id': 3, 'name': 'target-3', 'target_source': None}
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instance = OneToOneTarget.objects.get(pk=3)
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serializer = OneToOneTargetSerializer(instance, data=data)
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self.assertTrue(serializer.is_valid())
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obj = serializer.save()
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# Ensure (target_source 3, source 3) are deleted,
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# and everything else is as expected.
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queryset = OneToOneTarget.objects.all()
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serializer = OneToOneTargetSerializer(queryset)
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expected = [
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{'id': 1, 'name': 'target-1', 'target_source': {'id': 1, 'name': 'target-source-1', 'source': {'id': 1, 'name': 'source-1'}}},
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{'id': 2, 'name': 'target-2', 'target_source': {'id': 2, 'name': 'target-source-2', 'source': {'id': 2, 'name': 'source-2'}}},
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{'id': 3, 'name': 'target-3', 'target_source': None}
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]
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self.assertEqual(serializer.data, expected)
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@ -124,7 +124,7 @@ class WritableNestedSerializerObjectTests(TestCase):
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def __init__(self, order, title, duration):
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self.order, self.title, self.duration = order, title, duration
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def __cmp__(self, other):
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def __eq__(self, other):
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return (
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self.order == other.order and
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self.title == other.title and
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@ -135,7 +135,7 @@ class WritableNestedSerializerObjectTests(TestCase):
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def __init__(self, album_name, artist, tracks):
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self.album_name, self.artist, self.tracks = album_name, artist, tracks
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def __cmp__(self, other):
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def __eq__(self, other):
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return (
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self.album_name == other.album_name and
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self.artist == other.artist and
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