Django Rest Framework:动态返回字段子集
我想向fields基于Django Rest Framework的API 添加查询参数,该参数使用户只能为每个资源选择字段的子集。
例
序列化器:
class IdentitySerializer(serializers.HyperlinkedModelSerializer): class Meta:
model = models.Identity
fields = ('id', 'url', 'type', 'data')
常规查询将返回所有字段。
GET /identities/
[
{
"id": 1,
"url": "http://localhost:8000/api/identities/1/",
"type": 5,
"data": "John Doe"
},
...
]
具有fields
参数的查询应仅返回字段的子集:
GET /identities/?fields=id,data
[ {
"id": 1,
"data": "John Doe"
},
...
]
具有无效字段的查询应忽略无效字段或引发客户端错误。
目标
这是否可能开箱即用?如果没有,最简单的实现方法是什么?周围是否有第三方包装?
回答:
你可以覆盖序列化__init__
方法,并fields
根据查询参数动态设置属性。你可以在request
整个上下文中访问对象,并将其传递给序列化程序。
这是此问题的Django Rest Framework文档示例的复制和粘贴:
from rest_framework import serializersclass DynamicFieldsModelSerializer(serializers.ModelSerializer):
"""
A ModelSerializer that takes an additional `fields` argument that
controls which fields should be displayed.
"""
def __init__(self, *args, **kwargs):
# Instantiate the superclass normally
super(DynamicFieldsModelSerializer, self).__init__(*args, **kwargs)
fields = self.context['request'].query_params.get('fields')
if fields:
fields = fields.split(',')
# Drop any fields that are not specified in the `fields` argument.
allowed = set(fields)
existing = set(self.fields.keys())
for field_name in existing - allowed:
self.fields.pop(field_name)
class UserSerializer(DynamicFieldsModelSerializer, serializers.HyperlinkedModelSerializer):
class Meta:
model = User
fields = ('url', 'username', 'email')
以上是 Django Rest Framework:动态返回字段子集 的全部内容, 来源链接: utcz.com/qa/428626.html