rest-framework 视图类源码分析

从miminx 类开始，依次有子类RetrieveModelMixin（单个get 请求））

,ListModelMixin（LIST请求）,CreateModelMixin（POST请求）,UpdateModelMixin（update更新请求）,DestroyModelMixin(delete)删除请求

从url角度总结：

    url(r'^(?P<version>[v1|v2]+)/test1/$', views.TestView1.as_view({'get':'list','post':'create'})),
    url(r'^(?P<version>[v1|v2]+)/test1/(?P<pk>\+d)$', views.TestView1.as_view({'put':'update','patch':'partial_update',
                                                                               'delete':'destroy','get':'retrieve'}))

源码分析：以ListAPIView分析

from  rest_framework import  response
from  rest_framework.generics import  ListAPIView,RetrieveAPIView
from rest_framework.response import Response
from auction.utils.PageFilter.filters import PullDownRefreshFilter,ReachBottomFilter
from auction.utils.PageFilter.paginations import AuctionLimitPagination
from api import  models
from rest_framework.viewsets import GenericViewSet
from rest_framework.mixins import  RetrieveModelMixin,ListModelMixin
class auctionView(ListAPIView):
      # 如果是列表必须两个数据，一个是查询数据，一个是序列化
      queryset = models.Auction.objects.filter(status__gt=0).order_by('id')
      serializer_class = auctionSerializers
      filter_backends = [ReachBottomFilter,PullDownRefreshFilter]
      pagination_class = AuctionLimitPagination
   源码解析：
# 第一步：LISTAPIView 继承mixins.ListModelMixin,GenericAPIView；ListModelMixin类中def get()方法，可以替视图接受GET请求
   class ListAPIView(mixins.ListModelMixin,
                  GenericAPIView):
    """
    Concrete view for listing a queryset.
    """
    def get(self, request, *args, **kwargs):
        return self.list(request, *args, **kwargs)
# 第二步 执行类ListModelMixin的self.list（）方法

        def list(self, request, *args, **kwargs):
        queryset = self.filter_queryset(self.get_queryset())

        page = self.paginate_queryset(queryset)
        if page is not None:
            serializer = self.get_serializer(page, many=True)
            return self.get_paginated_response(serializer.data)

        serializer = self.get_serializer(queryset, many=True)
        return Response(serializer.data)
#第三步执行self.get_querset()获取queryset ,是类GenericAPIView的方法
         def get_queryset(self):
        assert self.queryset is not None, (
            "'%s' should either include a `queryset` attribute, "
            "or override the `get_queryset()` method."
            % self.__class__.__name__
        )

        queryset = self.queryset# 获取 ListAPIView的queryset
         # 是否是对象，类，或元组，
        if isinstance(queryset, QuerySet):
            # Ensure queryset is re-evaluated on each request.
            queryset = queryset.all()
        return queryset
# 第四步 执行self.filter_queryset（queryset）是类GenericAPIView的方法
     # 过滤queryset
    def filter_queryset(self, queryset):
        ""
        """
        for backend in list(self.filter_backends):#self.filter_backends过滤条件
            queryset = backend().filter_queryset(self.request, queryset, self)
        return queryset
# 第五步 执行self.paginate_querys（），是类GenericAPIView的方法
     # 对queryset进行分页处理
    def paginate_queryset(self, queryset):
        """
        Return a single page of results, or `None` if pagination is disabled.
        """
        if self.paginator is None:
            return None
        return self.paginator.paginate_queryset(queryset, self.request, view=self)
# 第六步 执行self.get_serializer方法（），返回self.serializer_class，并实例序列化
        def get_serializer_class(self)：
        assert self.serializer_class is not None, (
            "'%s' should either include a `serializer_class` attribute, "
            "or override the `get_serializer_class()` method."
            % self.__class__.__name__
        )

        return self.serializer_class
 # 第七步  get_paginated_response(serializer.data) ，返回序列化结果

其他几个类

RetrieveModelMixin（单个get 请求））,CreateModelMixin（POST请求）,UpdateModelMixin（update更新请求）,DestroyModelMixin(delete)删除请求源码分析同理。