django 视图GenericView

from rest_framework.generics import GenericAPIView
from .models import Student,TeacherClass,Teacher,Class
from  .serializers import SerializerStudent
from rest_framework.response import Response
from rest_framework.status import HTTP_200_OK



class  StudentGenericView(GenericAPIView):
    queryset = Student.objects.filter(is_delete=False).all()
    serializer_class = SerializerStudent

    def get(self,request,pk):
        if pk :
            student=self.get_object() # one row
            serializer=SerializerStudent(instance=student)
            return Response(data=serializer.data,status=HTTP_200_OK)

        else:
            students=self.get_queryset() # all rows
            serializer=SerializerStudent(instance=students,many=True)
            return Response(data=serializer.data,status=HTTP_200_OK)

    def post(self,request,*args,**kwargs):
        serializer=SerializerStudent(data=request.data)
        if serializer.is_valid():
            serializer.save()
            data,status=serializer.data,200
        else:
            data,status=serializer.errors,400

        return  Response(data=data,status=status)


    def put(self,request,pk):
        student=self.get_object()
        serializer=SerializerStudent(instance=student,data=request.data)
        if serializer.is_valid():
            serializer.save()
            data=serializer.data
        else:
            data=serializer.errors
        return Response(data=data, status=HTTP_200_OK)

    def delete(self,request,pk):
        if pk :
            instance=self.get_object()
            instance.is_delete=True
            instance.save()
            serializer=SerializerStudent(instance=instance)
            return Response(data=serializer.data)

　以上是基于GenericView实现增删改查，实现是单个查询借助self.get_object()以及路由pk进行查询，批量所有数据集合借助queryset,序列化器借助serializer_class

源码解析：

class GenericAPIView(views.APIView):
    """
    Base class for all other generic views.它是其他所有generic的视图的基类视图，提供了self.get_serializer_class 方法，self.get_object方法
　　其次继承了Apiview,dispatch inital 方法

    """
    # You'll need to either set these attributes,
    # or override `get_queryset()`/`get_serializer_class()`.
    # If you are overriding a view method, it is important that you call
    # `get_queryset()` instead of accessing the `queryset` property directly,
    # as `queryset` will get evaluated only once, and those results are cached
    # for all subsequent requests.
    queryset = None
    serializer_class = None

    # If you want to use object lookups other than pk, set 'lookup_field'.
    # For more complex lookup requirements override `get_object()`.
    lookup_field = 'pk'
    lookup_url_kwarg = None

    # The filter backend classes to use for queryset filtering
    filter_backends = api_settings.DEFAULT_FILTER_BACKENDS

    # The style to use for queryset pagination.
    pagination_class = api_settings.DEFAULT_PAGINATION_CLASS

generic 视图方法包括以下几个

 mixmin里面实现了几个重要mixmin类基于list,update,destroy,create 方法：

 在五个基本的generic 视图类身上又进一步多继承实现了更加简单丰富的类方法：

modelviewset:

from rest_framework.viewsets import ViewSet,GenericViewSet,ModelViewSet
源码解读：

 url.py

urlpatterns = [
    url(r'^student/$',model_view.StudentModelView.as_view({"get":"list","post":"create"})),
    url(r'^student/(?P<pk>.*)$', model_view.StudentModelView.as_view({"get": "retrieve",
                                                                      "put": "update","delete":"destroy"})),

]

Response 代码解读：

第一步调用get_objectc查询对象：

第二步：没找到就报Http404