Use of views

View Introduction

APIView —> GenericAPIView —> View extension class —> Subclass view

1.APIView

Import before use

from rest_framework.views import APIView

class StaffDetaView(APIView):
    def get(self,request,pk):
         return Response({
    "code":200,"msg":' To be successful '})
    def put(self,request,pk,**kwargs):
        #  according to id Find the corresponding information , Returns the object 
        staff = Staff.objects.filter(id=pk).first()

       if not staff:
        return Response({
    
              "code":400,
             "msg":' The modified data does not exist '
          })
        #  Deserialization   to update 
       # partial  Implement local update 
     ser = StaffSerializer(instance=staff, data=request.data, partial=True)
  
       #  Check the data 
       if ser.is_valid():
           ser.save() #  call update
           return Response({
    
              "code": 200,
                 "msg": ' Modification successful '
            })
         else:
             return Response({
    "code":400,"msg":ser.errors})

         return self.update(request,pk,**kwargs)

     def delete(self,request,pk):
    
         return Response({
    "code":200,"msg":' Delete employee succeeded '})

2.GenericAPIView

Inherited from APIView

from rest_framework.generics import GenericAPIView

General properties

• queryset View query set
• serializer_class The serializer used by the view

List view uses ：

• pagination_class Paging control class
• filter_backends Filter control back end , Filter fields

The detail page view uses

• lookup_field The condition field used when querying a single data object , The default is ’pk’
• lookup_url_kwarg When querying single data URL Keyword parameters in , Default and look_field identical

Common methods ：

• get_queryset()
  - Returns the query set used by the view
  - Default return queryset attribute , Support to rewrite
• get_serializer_class()
  - Returns the serializer class , Default return serializer_class, Can be rewritten
• get_serializer(self, *args, **kwargs)
  - Returns the serializer object

Details page unique method

• get_object()
  - Default parameters to filter

class StaffView(GenericAPIView):
    queryset = Staff.objects.all()
    serializer_class = StaffSerializer
     def get(self,request,*args,**kwargs):
         staff_info = self.get_queryset()
         #  serialize , Return a serialized object 
         staff_all = self.get_seializer(staff_info,many=True)
         return Response({
    
             "staff":staff_all.data
         })

3. The extension class

The extension class	Encapsulation method	explain
ListModelMixin	List	Get a set of data
CreateModelMixin	create	Add a piece of data
RetrieveModelMixin	retrieve	Get the specified data
UpdateModelMixin	update	Update specified data
DestroyModelMixin	destroy	Delete specified data

class StaffView(GenericAPIView,ListModelMixin):
    queryset = Staff.objects.all()
    serializer_class = StaffSerializer
    def get(self,request,*args,**kwargs):
         return self.list(request,*args,**kwargs)

4. View subclass

Subclass view class	Inherit	Request processing method
ListAPIView	GenericAPIView、ListModelMixin	get
CreateAPIView	GenericAPIView、CreateModelMixin	post
RetrieveAPIView	GenericAPIView、RetrieveModelMixin	get
UpdateAPIView	GenericAPIView、UpdateModelMixin	put
DestroyAPIView	GenericAPIView、DestroyModelMixin	delete
ListCreateAPIView	GenericAPIView、ListModelMixin、CreateModelMixin	get and post
RetrieveUpdateAPIView	GenericAPIView、RetrieveModelMixin、UpdateModelMixin	get、put
RetrieveDestroyAPIView	GenericAPIView、RetrieveModelMixin、DestroyModelMixin	get and delete
RetrieveUpdateDestroyAPIView	GenericAPIView、RetrieveModelMixin、UpdateModelMixin、DestroyModelMixin	get、put、delete

Import

from rest_framework.generics import *

class StaffView(ListCreateAPIView):
    queryset = Staff.objects.all()
    serializer_class = StaffSerializer

notes ： This is an example , Other view methods are the same