[drf]源码和序列化梳理

drf源码继承管理

# drf继承关系

View
APIView
    as_view:
        执行父类的as_view
        调用dispatch
    dispatch
        init_request
            request.queryparams
            request.Data
        init
            内容协商/版本
            认证/授权/限流

GenericAPIView
    get_queryset
    get_serializerclass
    过滤/分页

viewset
    重写as_view方法

drf系列参考

# drf和orm耦合度太高? 可以继承viewsets.ViewSet类.逃脱了gennericapiview
class ViewSet(ViewSetMixin, views.APIView):pass

class GetTaskIpLogViewSet(viewsets.ViewSet):

    def list(self, request, *args, **kwargs):
        data = get_task_ip_log("cat /etc/hosts")
        return Response(data)

序列化器

api参考

//序列化api: 后端 -> 浏览器

serializer = CommentSerializer(comment) # 对象/queryset -> dict
serializer.data
# {'email': 'leila@example.com', 'content': 'foo bar', 'created': '2016-01-27T15:17:10.375877'}

from rest_framework.renderers import JSONRenderer

json = JSONRenderer().render(serializer.data) # 多个对象many=true
json
# b'{"email":"leila@example.com","content":"foo bar","created":"2016-01-27T15:17:10.375877"}'

//反序列化api: 浏览器 -> 后端

# 准备字节流
from django.utils.six import BytesIO
from rest_framework.parsers import JSONParser

stream = BytesIO(json)
data = JSONParser().parse(stream)

serializer = CommentSerializer(data=data) # 多个对象many=true
serializer.is_valid()
# True
serializer.validated_data
serializer.errors

// 校验post参数的合法性
# 还可以自定义复杂的验证器 1.基于字段 2.基于对象 3.全局定义验证器

class CommentSerializer(serializers.Serializer):
    email = serializers.EmailField()
    content = serializers.CharField(max_length=200)
    created = serializers.DateTimeField()

from rest_framework import viewsets

class UserViewset(viewsets.ViewSet):
    def list(self, request, *args, **kwargs):

        return Response("hello")

    def create(self, request, *args, **kwargs):

        serializer = CommentSerializer(data=request.data, many=True)
        if serializer.is_valid(raise_exception=True):  # 抛出404.默认不写是200
            return Response(serializer.validated_data)
        else:
            return Response(serializer.errors)

序列化通用参数