1. 基於類的檢視函式（views.py)

from snippets.models import Snippet
from snippets.serializers import SnippetSerializer
from django.http import Http404
# APIView 
from rest_framework.views import APIView
# 返回物件
from rest_framework.response import Response
# 狀態碼
from rest_framework import status

# 多個物件
class
 
 SnippetList(APIView):
    def get(self, request, format=None):
        snippets = Snippet.objects.all()
        serializer = SnippetSerializer(snippets, many=True)
        return Response(serializer.data)
    def post(self, request, format=None):
        serializer = SnippetSerializer(data=request.data)
        if
 
 serializer.is_valid():
            serializer.save()
            return Response(serializer.data, status=status.HTTP_201_CREATED)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)


# 單個物件的部分修改（APIView提供了一些request和response物件）
class SnippetDetail(APIView):
    """
    檢索，更新或刪除一個例項
    """
 

    # 首先獲取物件， 發生異常就丟擲404頁面
    def get_object(self, pk):
        try:
            return Snippet.objects.get(pk=pk)
        except Snippet.DoesNotExist:
            raise Http404

    def get(self, request, pk, format=None):
        snippet = self.get_object(pk)
        serializer = SnippetSerializer(snippet)
        return Response(serializer.data)

    def put(self, request, pk, format=None):
        snippet = self.get_object(pk)
        serializer = SnippetSerializer(snippet, data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

    def delete(self, request, pk, format=None):
        snippet = self.get_object(pk)
        snippet.delete()
        return Response(status=status.HTTP_204_NO_CONTENT)

# 重構urls.py
urlpatterns = [
    url(r'^snippets/$', views.SnippetList.as_view()),
    url(r'^snippets/(?P<pk>[0-9]+)/$', views.SnippetDetail.as_view()),
]
# 字尾
urlpatterns = format_suffix_patterns(urlpatterns)

2. 基於Mixin類重構檢視類

from snippets.models import Snippet
from snippets.serializers import SnippetSerializer
from rest_framework import mixins
from rest_framework import generics

class SnippetList(mixins.ListModelMixin,
                  mixins.CreateModelMixin,
                  generics.GenericAPIView):
    # 雷打不動，必須的
    queryset = Snippet.objects.all()
    serializer_class = SnippetSerializer

    def get(self, request, *args, **kwargs):
        return self.list(request, *args, **kwargs)

    def post(self, request, *args, **kwargs):
        return self.create(request, *args, **kwargs)

• CreateModelMixin: 定義了建立一個序列物件的方法create(self, request, *args, **kwargs)，儲存方法perform_create(self, serializer)，成功獲取請求頭的方法：get_success_headers(self, data)
• ListModelMixin： 定義了一個獲取查詢集的方法, many=True：list(self, request, *args, **kwargs)
• RetrieveModelMixin: 定義了一個檢索方法，retrieve(self, request, *args, **kwargs)
• UpdateModelMixin： 更新一個模型例項，update(self, request, *args, **kwargs)
• DestroyModelMixin： 刪除一個模型例項，方法destroy(self, request, *args, **kwargs)

from snippets.models import Snippet
from snippets.serializers import SnippetSerializer
from rest_framework import mixins
from rest_framework import generics
# 重構單個例項處理方法
class SnippetList(mixins.ListModelMixin,
                  mixins.CreateModelMixin,
                  generics.GenericAPIView):
    queryset = Snippet.objects.all()
    serializer_class = SnippetSerializer

    def get(self, request, *args, **kwargs):
        return self.list(request, *args, **kwargs)

    def post(self, request, *args, **kwargs):
        return self.create(request, *args, **kwargs)

3.複合功能的View類

1. GenericAPIView：基本的View類，定義了一些常用的方法
   
   • get_queryset： 獲取所有查詢集，返回序列器中指定queryset模型的全部物件
   • get_object： 根據傳入的查詢引數（lookup_url_kwarg or lookup_field)獲取查詢物件，然後返回， 一般進行聯合查詢時， 需要重寫此方法
   • get_serializer: 獲取序列化例項，傳入的引數需要通過驗證
   • get_serializer_context： 返回序列化的類，api檢視中看到的那一大串
   • paginate_queryset： 進行分頁，返回分頁後的單頁結果集
   • get_paginated_response：返回分也好的結果集到前臺
2. CreateAPIView
3. ListAPIView
4. RetrieveAPIView
5. DestroyAPIView
6. UpdateAPIView
7. ListCreateAPIView
8. RetrieveUpdateAPIView
9. RetrieveDestroyAPIView
10. RetrieveUpdateDestroyAPIView