def errors(self):
"""
Run deserialization and return error data,
setting self.object if no errors occurred.
"""
if self._errors is None:
data, files = self.init_data, self.init_files
if self.many is not None:
many = self.many
else:
many = hasattr(data, '__iter__') and not isinstance(data, (Page, dict, six.text_type))
if many:
raise AssertionError('Implicit list/queryset serialization is deprecated. '
'Use the `many=True` flag when instantiating the serializer.')
if many:
ret = RelationsList()
errors = []
update = self.object is not None
if update:
# If this is a bulk update we need to map all the objects
# to a canonical identity so we can determine which
# individual object is being updated for each item in the
# incoming data
objects = self.object
identities = [self.get_identity(self.to_native(obj)) for obj in objects]
identity_to_objects = dict(zip(identities, objects))
if hasattr(data, '__iter__') and not isinstance(data, (dict, six.text_type)):
for item in data:
if update:
# Determine which object we're updating
identity = self.get_identity(item)
# noinspection PyUnboundLocalVariable
self.object = identity_to_objects.pop(identity, None)
if self.object is None and not self.allow_add_remove:
ret.append(None)
errors.append({'non_field_errors': [
'Cannot create a new item, only existing items may be updated.'
]})
continue
ret.append(self.from_native(item, None))
errors.append(self._errors)
if update and self.allow_add_remove:
ret._deleted = identity_to_objects.values()
self._errors = any(errors) and errors or []
else:
self._errors = {'non_field_errors': ['Expected a list of items.']}
else:
ret = self.from_native(data, files)
if not self._errors:
self.object = ret
return self._errors
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