Django:RestFramework之-------视图

10.视图

• GenericAPIView封装一些方法,将这些方法返回值放在类变量位置上.

  

1.GenericAPIView视图示例:不怎么用

from api.utils.serializers.pager import PagerSerialiser
from rest_framework.generics import GenericAPIView

class VView(GenericAPIView):
    #获取模型类
    queryset = models.Role.objects.all()
    #序列化器
    serializer_class = PagerSerialiser
    #分页设置
    pagination_class = PageNumberPagination
    def get(self,request,*args,**kwargs):
        roles = self.get_queryset()#获得数据
        #分页获取
        pager_roles = self.paginate_queryset(roles)
        #序列化
        ser = self.get_serializer(instance=pager_roles,many=True)
        return Response(ser.data)

2.GenericViewSet视图类

• 实现自定义路由执行函数

#urls.py
#get方法过来执行VView get请求执行list方法. post请求执行tijiao
url(r'^(?P<version>[v1|v2]+)/vview/$', views.VView.as_view({"get":"list","post":"tijiao"}),),
#视图函数:
from rest_framework.viewsets import GenericViewSet
class VView(GenericViewSet):
    #获取模型类
    queryset = models.Role.objects.all()
    #序列化器
    serializer_class = PagerSerialiser
    #分页设置
    pagination_class = PageNumberPagination
    def list(self,request,*args,**kwargs):
        roles = self.get_queryset()#获得数据
        #分页获取
        pager_roles = self.paginate_queryset(roles)
        #序列化
        ser = self.get_serializer(instance=pager_roles,many=True)
        return Response(ser.data)
    def tijiao(self,request,*args,**kwargs):pass

3.ListModelMixin 封装get请求

4.CreateModelMixin 自带post请求

#urls.py
url(r'^(?P<version>[v1|v2]+)/vview/$', views.VView.as_view({"get":"list","post":"create"}),),
#GenericViewSet自定义request.methods处理方法,在url上设置
#视图函数:
from rest_framework.viewsets import GenericViewSet
from rest_framework.mixins import ListModelMixin,CreateModelMixin
class VView(ListModelMixin,CreateModelMixin,GenericViewSet):
    #获取模型类
    queryset = models.Role.objects.all()
    #序列化器
    serializer_class = PagerSerialiser
    #分页设置
    pagination_class = PageNumberPagination

5.ModelViewSet

• 让你的代码变得简单舒服
• ModelViewSet继承了前面所有类的功能

#urls.py
#设置{"get":"list"}  内置封装好了方法返回所有数据
url(r'^(?P<version>[v1|v2]+)/vview/$', views.VView.as_view({"get":"list"}),),
url(r'^(?P<version>[v1|v2]+)/vview/(?P<pk>\d+)/$', views.VView.as_view(
        {"get":"retrieve","delete":"destroy","put":"update","patch":"partial_update"}),
        ),
"""
"get":"retrieve"    获取单个数据   访问URL:http://127.0.0.1:8000/api/v1/vview/2/
"delete":"destroy"   删除单个数据
"put":"update"       更新一条数据
"patch":"partial_update"   修改一条数据
"""

from rest_framework.viewsets import ModelViewSet
class VView(ModelViewSet):
    #获取模型类
    queryset = models.Role.objects.all()
    #序列化器
    serializer_class = PagerSerialiser
    #分页设置
    pagination_class = PageNumberPagination

• 显示效果

6.总结

1.基本增删改查用ModelViewSet
2.只有增删   CreateModelMixin,DestroyModelMixin,GenericViewSet
3.复杂增删改查,可以使用GenericViewSet  或 APIView

• 知识拓展

  GenericViewSet.get_object  只有调用get_object
  	check_object_permissions  用于判断你这个用户对这个对象是否有调用权限.
  
  	has_object_permission  才会生效此方法