DRF檢視

APIview

django中寫CBV的時候是繼承View，而rest_framework繼承的是APIView，那麼他們兩個有什麼不同

urlpatterns = [
    url(r'^book$', BookView.as_view()),
    url(r'^book/(?P<id>\d+)$', BookEditView.as_view()),
]

　不管是View還是APIView最開始呼叫的都是as_view()方法,看原始碼有什麼區別

我們能看到，APIView繼承了View, 並且執行了View中的as_view()方法，最後把view返回了，用csrf_exempt()方法包裹後去掉了csrf的認證。

然後看view中as_view()方法做了什麼

在View中的as_view方法返回了view函式，而view函式執行了self.dispatch()方法 ,但是這裡的dispatch方法按照順序應該從自己開始尋找,而在APIview中,也寫了dispatch方法,所以應該執行的是APIview中的dispatch方法

這裡我我需要注意initialize_request中到底做了什麼

 這裡返回的是一個例項化物件

這會django原先的request變成了self._request

 檢視

自己寫的版本

# 自己重寫的檢視
from rest_framework.views import APIView
from rest_framework.response import Response
from rest_framework.viewsets import ViewSetMixin
# 獲取要的資料
class GenericAPIView(APIView):
    queryset = None
    serializer_class = None

    # 獲取queryset
    def get_queryset(self):
        
 
return self.queryset.all()

    # 獲取序列化器
    def get_serializer(self, *args, **kwargs):
        return self.serializer_class(*args, **kwargs)


# get方法(查詢多條)
class ListModelMixin(object):
    def list(self, request):
        queryset = self.get_queryset()
        ser_obj = self.get_serializer(queryset, many=True)
        return Response(ser_obj.data)


# 查詢單條
class RetrieveModelMixin(object):
    def retrieve(self, request, id):
        stu_obj = self.get_queryset().filter(id=id).first()
        ser_obj = self.get_serializer(stu_obj)
        return Response(ser_obj.data)


# post方法
class CreateModelMixin(object):
    def create(self, request):
        ser_obj = self.get_serializer(data=request.data)
        if ser_obj.is_valid():
            ser_obj.save()
            return Response(ser_obj.data)
        else:
            return Response(ser_obj.errors)


# put/patch方法:修改單個的
class UpdateModelMixin(object):
    def update(self, request, id):
        stu_obj = self.get_queryset().filter(id=id).first()
        ser_obj = self.get_serializer(instance=stu_obj, data=request.data, partial=True)
        if ser_obj.is_valid():
            ser_obj.save()
            return Response(ser_obj.validated_data)
        return Response(ser_obj.errors)


# delete方法
class DestroyModelsMixin(object):
    def destroy(self, request, id):
        stu_obj = self.get_queryset().filter(id=id).first()
        if stu_obj:
            stu_obj.delete()
            return Response("")
        return Response("刪除的物件不存在")


# # 所有方法只要繼承這個就可以
class ModelViewSet(
    ViewSetMixin,
    GenericAPIView,
    ListModelMixin,
    RetrieveModelMixin,
    CreateModelMixin,
    UpdateModelMixin,
    DestroyModelsMixin,

):
    pass

class Student(ModelViewSet):
    queryset = models.Student.objects
    serializer_class = StudentSerializer

他還有一個自帶的模組和這個一樣

from rest_framework.viewsets import ModelViewSet
class Student(ModelViewSet):
    queryset = models.Student.objects
    serializer_class = StudentSerializer

urls.py程式碼

DRF的路由

 這個路由其實也封裝好了,但是封裝越好的東西,應用場景限制的也越多

from .views import BookView
from rest_framework.routers import DefaultRouter

router = DefaultRouter()
router.register(r"book", BookView)

urlpatterns = [
    # url(r'^book$', BookView.as_view()),
    # url(r'^book/(?P<id>\d+)$', BookEditView.as_view()),
    # url(r'^book$', BookView.as_view({"get": "list", "post": "create"})),
    # url(r'^book/(?P<pk>\d+)$', BookView.as_view({"get": "retrieve", "patch": "update", "delete": "destroy"})),

]
urlpatterns += router.urls