视图：

   a. django

      class Test(View):

      	...

   b. rest_framework

      class Test(APIView):

      	...

   c. GenericAPIView 一般不用这个类来做视图

from rest_framework.generics import GenericAPIView

class ViewView(GenericAPIView):

	queryset = models.Role.objects.all()

	serializer_class = PagerSerializer

	pagination_class = PageNumberPagination

	def get(self,reuqest,*args,**kwargs):

		#获取数据  models.Role.objects.all()

		roles = self.get_queryset()

		pager_roles = self.paginate_queryset(roles)

		#序列化

		self.get_serializer(instance=pager_roles,many=True)

		return Response(ser.data)

   d. GenericViewSet(ViewSetMixin, generics.GenericAPIView) 继承两个父类

#需要路由传参数  url(r'^(?P<version>[v1|v2]+)/v1/$',views.ViewView.as_view({'get':'list','post':'post_list'})),

#参数传递给 ViewView get方法执行list  post方法执行post_list

from rest_framework.viewsets import GenericViewSet

class ViewView(GenericViewSet):

	  def list(self,request,*args,**kwargs):

	  return Response('GET')

	  def post_list(self,request,*args,**kwargs):

	  return Response('POST')

   e. ModelViewSet(

   			mixins.CreateModelMixin,

   			mixins.RetrieveModelMixin,

   			mixins.updateModelMinxin,

   			mixins.DestroyModelMinxin,

   			mixins.ListModelMixin,

   			GenericViewSet)

#需要路由传参数  url(r'^(?P<version>[v1|v2]+)/v1/(?P<pk>\d+)/$',views.ViewView.as_view({'get':'retrieve','delete':'destroy','put':'update','patch':'partial_update'})),

# 继承ModelViewSet 所有的 增删改查的功能都有了

# 如果是get请求  retrieve获取单条数据 根据传的参数pk来查询

# 如果是delete请求  destroy删除数据

# 如果是put请求  update更新数据

# 如果是patch请求  partial_update 部分更新数据

# list 查询所有数据

# create 增加数据

# 需要关注路由系统 {'get':'retrieve','delete':'destroy','put':'update','patch':'partial_update'} {'get':'list','post':'post_list'}

from rest_framework.viewsets import ModelViewSet

class ViewView(ModelViewSet):

	  queryset = models.Role.objects.all()

	  serializer_class = PagerSerializer

	  pagination_class = PageNumberPagination

总结：

    - 大部分使用 APIView

    - 也可以使用 GenericViewSet 在路由中区分get,post

    - 基本的增删改查实现 继承 ModelViewSet

    - 增删 继承GenericViewSet， CreateModelMixin，DestroyModelMinxin

    - 复杂逻辑 继承GenericViewSet 或者 APIView