一.先看原码：

​​​​​​​class ModelViewSet(mixins.CreateModelMixin,
                   mixins.RetrieveModelMixin,
                   mixins.UpdateModelMixin,
                   mixins.DestroyModelMixin,
                   mixins.ListModelMixin,
                   GenericViewSet):
    """
    A viewset that provides default `create()`, `retrieve()`, `update()`,
    `partial_update()`, `destroy()` and `list()` actions.
    """
    pass

二.使用：

因为继承关系为ModelViewSet < GenericViewSet < GenericAPIView。

GenericAPIView内必须定义属性：queryset 和 serializer_class 

所以ModelViewSet 通常结合 ModelSerializer 使用

class ProjectTypeSerializer(serializers.ModelSerializer):
    """项目类型序列化器"""

    class Meta:
        model = ProjectType
        fields = '__all__'

from rest_framework.decorators import action

class ProjectTypeViewSet(ModelViewSet):
    #permission_classes = (IsAuthenticated,)
    queryset = ProjectType.objects.filter(is_delete=0).all().order_by('-id')
    serializer_class = ProjectTypeSerializer
    
    #自定义方法
    @action(methods=['get','post'], detail=False, url_path='user_action')
    def user_action(self,request, *args, **kwargs):
        dd = {"w":"ww","ee":"ttt"}
        return Response(dd)

三.路由配置：

from rest_framework.routers import DefaultRouter
from . import views

app_name = 'app1'
router = DefaultRouter()  # 可以处理视图的路由器

router.register(r'projects', views.ProjectTypeViewSet)

urlpatterns = [
    #url(r'^configyml/$', views.configYml),
]
urlpatterns += router.urls

四.访问：

 由于modelviewset也集成了mix相关类所以有get,post,delete, put相关对应的方法

五.补充 @action中 detail=True 则表示对某个具体实例操作：

127.0.0.1:8000/projects/{id}/user_action