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# -*- coding: utf-8 -*-
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#
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from django.core.exceptions import ObjectDoesNotExist
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from rest_framework.utils import html
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from rest_framework.settings import api_settings
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from rest_framework.exceptions import ValidationError
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from rest_framework.fields import SkipField, empty
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__all__ = ['BulkSerializerMixin', 'BulkListSerializerMixin']
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class BulkSerializerMixin(object):
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"""
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Become rest_framework_bulk not support uuid as a primary key
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so rewrite it. https://github.com/miki725/django-rest-framework-bulk/issues/66
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"""
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def to_internal_value(self, data):
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from rest_framework_bulk import BulkListSerializer
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ret = super(BulkSerializerMixin, self).to_internal_value(data)
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id_attr = getattr(self.Meta, 'update_lookup_field', 'id')
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if self.context.get('view'):
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request_method = getattr(getattr(self.context.get('view'), 'request'), 'method', '')
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# add update_lookup_field field back to validated data
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# since super by default strips out read-only fields
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# hence id will no longer be present in validated_data
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if all((isinstance(self.root, BulkListSerializer),
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id_attr,
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request_method in ('PUT', 'PATCH'))):
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id_field = self.fields.get("id") or self.fields.get('pk')
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if data.get("id"):
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id_value = id_field.to_internal_value(data.get("id"))
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else:
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id_value = id_field.to_internal_value(data.get("pk"))
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ret[id_attr] = id_value
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return ret
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def run_validation(self, data=empty):
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"""
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批量创建时，获取到的self.initial_data是list，
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所以想用一个属性来存放当前操作的数据集，在validate_field中使用
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:param data:
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:return:
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"""
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# 只有批量创建的时候，才需要重写 initial_data
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if self.parent:
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self.initial_data = data
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return super().run_validation(data)
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class BulkListSerializerMixin(object):
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"""
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Become rest_framework_bulk doing bulk update raise Exception:
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'QuerySet' object has no attribute 'pk' when doing bulk update
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so rewrite it .
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https://github.com/miki725/django-rest-framework-bulk/issues/68
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"""
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def to_internal_value(self, data):
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"""
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List of dicts of native values <- List of dicts of primitive datatypes.
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"""
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if not self.instance:
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return super().to_internal_value(data)
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if html.is_html_input(data):
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data = html.parse_html_list(data)
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if not isinstance(data, list):
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message = self.error_messages['not_a_list'].format(
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input_type=type(data).__name__
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)
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raise ValidationError({
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api_settings.NON_FIELD_ERRORS_KEY: [message]
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}, code='not_a_list')
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if not self.allow_empty and len(data) == 0:
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if self.parent and self.partial:
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raise SkipField()
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message = self.error_messages['empty']
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raise ValidationError({
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api_settings.NON_FIELD_ERRORS_KEY: [message]
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}, code='empty')
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ret = []
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errors = []
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for item in data:
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try:
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# prepare child serializer to only handle one instance
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if 'id' in item:
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pk = item["id"]
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elif 'pk' in item:
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pk = item["pk"]
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else:
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raise ValidationError("id or pk not in data")
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child = self.instance.get(id=pk) if self.instance else None
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self.child.instance = child
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self.child.initial_data = item
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# raw
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validated = self.child.run_validation(item)
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except ValidationError as exc:
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errors.append(exc.detail)
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except ObjectDoesNotExist as e:
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errors.append(e)
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else:
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ret.append(validated)
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errors.append({})
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if any(errors):
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raise ValidationError(errors)
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return ret
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