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One-to-many writable, nested serializer support
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@ -108,19 +108,21 @@ class BaseSerializer(WritableField):
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_dict_class = SortedDictWithMetadata
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def __init__(self, instance=None, data=None, files=None,
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context=None, partial=False, many=None, source=None):
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context=None, partial=False, many=None, source=None, required=True):
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super(BaseSerializer, self).__init__(source=source)
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self.opts = self._options_class(self.Meta)
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self.parent = None
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self.root = None
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self.partial = partial
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self.many = many
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self.required = required
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self.context = context or {}
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self.init_data = data
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self.init_files = files
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self.object = instance
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self.unused_objects = instance
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self.fields = self.get_fields()
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self._data = None
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@ -280,13 +282,50 @@ class BaseSerializer(WritableField):
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ret.fields[key] = field
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return ret
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def from_native(self, data, files):
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def _get_object_from_data(self, data):
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"""
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Get the corresponding object to deserialize the data into.
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"""
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if self.unused_objects is None: return None
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# Just get the first object in the list.
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if self.unused_objects:
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obj = self.unused_objects[0]
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obj = obj[0]
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self.unused_objects.remove(obj)
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else:
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obj = None
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return obj
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def from_native(self, data, files, many=False):
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"""
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Deserialize primitives -> objects.
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"""
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if hasattr(data, '__iter__') and not isinstance(data, (dict, six.text_type)):
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# TODO: error data when deserializing lists
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return [self.from_native(item, None) for item in data]
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if many:
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# Both our object and data must be in list form
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if ((data is not None and not (hasattr(data, '__iter__') and not isinstance(data, (Page, dict)))) or
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(self.object is not None and not (hasattr(self.object, '__iter__') and not isinstance(self.object, (Page, dict))))):
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self._errors = {'non_field_errors': ['Invalid data']}
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return None
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self._siblings = []
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self._errors = []
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for item in data:
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obj = self._get_object_from_data(item)
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# Deserializng a list of objects requires a separate
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# serializer for each object (otherwise nested objects
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# would share the nested serializers)
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sibling = self.__class__(obj, data=item, many=False)
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self._siblings.append(sibling)
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sibling.object = sibling.from_native(item, None)
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self._errors.append(sibling._errors)
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for obj in self.unused_objects or []:
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# Unused objects will be deleted.
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sibling = self.__class__(obj)
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sibling._delete = True
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self._siblings.append(sibling)
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return [sibling.object for sibling in self._siblings]
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self._errors = {}
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if data is not None or files is not None:
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@ -349,10 +388,7 @@ class BaseSerializer(WritableField):
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else:
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many = hasattr(data, '__iter__') and not isinstance(data, (Page, dict))
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# TODO: error data when deserializing lists
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if many:
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ret = [self.from_native(item, None) for item in data]
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ret = self.from_native(data, files)
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ret = self.from_native(data, files, many)
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if not self._errors:
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self.object = ret
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@ -409,6 +445,27 @@ class ModelSerializer(Serializer):
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"""
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_options_class = ModelSerializerOptions
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def _get_object_from_data(self, data):
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"""
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Get the corresponding object to deserialize the data into.
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"""
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if self.unused_objects is None: return None
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# Get the object based on pk
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pk_field_name = self.opts.model._meta.pk.name
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pk = data.get(pk_field_name, None)
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if pk:
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# Loop through objects and find one with pk or return None
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obj = [o for o in self.unused_objects if o.pk == pk]
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if obj:
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obj = obj[0]
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self.unused_objects.remove(obj)
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else:
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obj = None
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return obj
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else:
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return None
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def field_from_native(self, data, files, field_name, into):
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if self.read_only:
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return
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@ -423,14 +480,18 @@ class ModelSerializer(Serializer):
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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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if is_simple_callable(getattr(obj, 'all', None)):
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# If this is a relational manager we just want the objects
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obj = list(obj.all())
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self.object = obj
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self.unused_objects = obj
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if value in (None, ''):
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self._delete = True
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into[(self.source or field_name)] = self
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else:
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obj = self.from_native(value, files)
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if not self._errors:
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obj = self.from_native(value, files, self.many)
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if not any(self._errors):
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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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@ -623,15 +684,25 @@ class ModelSerializer(Serializer):
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return instance
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def from_native(self, data, files):
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def from_native(self, data, files, many=False):
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"""
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Override the default method to also include model field validation.
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"""
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instance = super(ModelSerializer, self).from_native(data, files)
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if instance:
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return self.full_clean(instance)
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instance = super(ModelSerializer, self).from_native(data, files, many)
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if self.many and hasattr(self, '_siblings'):
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objects = [s.full_clean(s.object) if s.object else None for s in self._siblings]
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self._errors = [s._errors for s in self._siblings]
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return objects
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else:
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if instance:
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return self.full_clean(instance)
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def _save(self, parent=None, fk_field=None):
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if self.many:
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for s in self._siblings:
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s._save(parent, fk_field)
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return
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if self._delete:
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self.object.delete()
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return
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@ -4,6 +4,28 @@ from django.test import TestCase
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from rest_framework import serializers
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class OneToManyTarget(models.Model):
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name = models.CharField(max_length=100)
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class OneToManyTargetSource(models.Model):
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name = models.CharField(max_length=100)
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target = models.ForeignKey(OneToManyTarget,
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related_name='target_sources')
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class OneToManySource(models.Model):
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name = models.CharField(max_length=100)
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target_source = models.ForeignKey(OneToManyTargetSource,
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related_name='sources')
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class OneToManySource(models.Model):
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name = models.CharField(max_length=100)
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target = models.ForeignKey(OneToManyTarget,
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related_name='sources')
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class OneToOneTarget(models.Model):
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name = models.CharField(max_length=100)
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@ -39,6 +61,101 @@ class OneToOneTargetSerializer(serializers.ModelSerializer):
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model = OneToOneTarget
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class OneToManySourceSerializer(serializers.ModelSerializer):
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class Meta:
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model = OneToManySource
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exclude = ('target_source', )
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class OneToManyTargetSourceSerializer(serializers.ModelSerializer):
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sources = OneToManySourceSerializer(many=True, required=False)
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class Meta:
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model = OneToManyTargetSource
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exclude = ('target', )
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class OneToManyTargetSerializer(serializers.ModelSerializer):
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target_sources = OneToManyTargetSourceSerializer(many=True)
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class Meta:
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model = OneToManyTarget
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class NestedOneToManyTests(TestCase):
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def setUp(self):
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target = OneToManyTarget(name='target-1')
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target.save()
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target_source = OneToManyTargetSource(name='target-source-1', target=target)
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target_source.save()
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for idx in range(1, 4):
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source = OneToManySource(name='source-%d' % idx, target_source=target_source)
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source.save()
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def test_one_to_many_retrieve(self):
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queryset = OneToManyTarget.objects.all()
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serializer = OneToManyTargetSerializer(queryset)
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expected = [
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{'id': 1, 'name': 'target-1', 'target_sources': [{'id': 1, 'name': 'target-source-1', 'sources': [{'id': 1, 'name': 'source-1'}, {'id': 2, 'name': 'source-2'}, {'id': 3, 'name': 'source-3'}]}]}
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]
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self.assertEquals(serializer.data, expected)
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def test_one_to_many_create(self):
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# Note the nonsensical source id given
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data = {'id': 2, 'name': 'target-2', 'target_sources': [{'id': 2, 'name': 'target-source-2', 'sources': [{'id': 2, 'name': 'source-4'}]}]}
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expected = {'id': 2, 'name': 'target-2', 'target_sources': [{'id': 2, 'name': 'target-source-2', 'sources': [{'id': 4, 'name': 'source-4'}]}]}
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serializer = OneToManyTargetSerializer(data=data)
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self.assertTrue(serializer.is_valid())
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obj = serializer.save()
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self.assertEquals(serializer.data, expected)
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self.assertEqual(obj.name, 'target-2')
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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 = OneToManyTarget.objects.all()
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serializer = OneToManyTargetSerializer(queryset)
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expected = [
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{'id': 1, 'name': 'target-1', 'target_sources': [{'id': 1, 'name': 'target-source-1', 'sources': [{'id': 1, 'name': 'source-1'}, {'id': 2, 'name': 'source-2'}, {'id': 3, 'name': 'source-3'}]}]},
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{'id': 2, 'name': 'target-2', 'target_sources': [{'id': 2, 'name': 'target-source-2', 'sources': [{'id': 4, 'name': 'source-4'}]}]}
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]
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self.assertEquals(serializer.data, expected)
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def test_one_to_many_update(self):
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data = {'id': 1, 'name': 'target-1-updated', 'target_sources': [{'id': 1, 'name': 'target-source-1-updated', 'sources': [{'id': 1, 'name': 'source-1-updated'}, {'id': 2, 'name': 'source-2'}, {'id': 3, 'name': 'source-3'}]}]}
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expected = {'id': 1, 'name': 'target-1-updated', 'target_sources': [{'id': 1, 'name': 'target-source-1-updated', 'sources': [{'id': 1, 'name': 'source-1-updated'}, {'id': 2, 'name': 'source-2'}, {'id': 3, 'name': 'source-3'}]}]}
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instance = OneToManyTarget.objects.get(pk=1)
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serializer = OneToManyTargetSerializer(instance, data=data)
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self.assertTrue(serializer.is_valid())
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obj = serializer.save()
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self.assertEquals(serializer.data, expected)
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self.assertEqual(obj.name, 'target-1-updated')
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# Ensure (target 1, target_source 1, source 1) are updated,
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# and everything else is as expected.
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queryset = OneToManyTarget.objects.all()
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serializer = OneToManyTargetSerializer(queryset)
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expected = [
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{'id': 1, 'name': 'target-1-updated', 'target_sources': [{'id': 1, 'name': 'target-source-1-updated', 'sources': [{'id': 1, 'name': 'source-1-updated'}, {'id': 2, 'name': 'source-2'}, {'id': 3, 'name': 'source-3'}]}]}
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]
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self.assertEquals(serializer.data, expected)
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def test_one_to_many_delete(self):
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data = {'id': 1, 'name': 'target-1', 'target_sources': [{'id': 1, 'name': 'target-source-1', 'sources': [{'id': 2, 'name': 'source-2'}]}]}
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instance = OneToManyTarget.objects.get(pk=1)
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serializer = OneToManyTargetSerializer(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 1 is deleted, and everything else is as
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# expected.
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queryset = OneToManyTarget.objects.all()
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serializer = OneToManyTargetSerializer(queryset)
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expected = [
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{'id': 1, 'name': 'target-1', 'target_sources': [{'id': 1, 'name': 'target-source-1', 'sources': [{'id': 2, 'name': 'source-2'}]}]}
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]
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self.assertEquals(serializer.data, expected)
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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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@ -59,7 +176,6 @@ class NestedOneToOneTests(TestCase):
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]
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self.assertEquals(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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