继承APIView和ViewSetMixin；
作用也与APIView基本类似，提供了身份认证、权限校验、流量管理等。
ViewSet在开发接口中不经常用
1、ViewSet源码
在ViewSet中，没有提供任何动作action方法，需要我们自己实现action方法。
class ViewSet(ViewSetMixin, views.APIView): """ The base ViewSet class does not provide any actions by default. """ passViewSet视图集类不再限制视图方法名只允许get()、post()等这种情况了，而是实现允许开发者根据自己的需要定义自定义方法名，例如 list() 、create() 等，然后经过路由中使用http和这些视图方法名进行绑定调用
2、ViewSetMixin源码
ViewSet主要通过继承ViewSetMixin来实现在调用as_view()时传入字典{“http请求”：“视图方法”}的映射处理工作，如
{‘get’:’list’，
‘post’:‘create’,
‘put’:‘update’,
‘delete’:‘destory’}，
@classonlymethod def as_view(cls, actions=None, **initkwargs): """ Because of the way class based views create a closure around the instantiated view, we need to totally reimplement `.as_view`, and slightly modify the view function that is created and returned. """ # The name and description initkwargs may be explicitly overridden for # certain route configurations. eg, names of extra actions. cls.name = None cls.description = None # The suffix initkwarg is reserved for displaying the viewset type. # This initkwarg should have no effect if the name is provided. # eg. 'List' or 'Instance'. cls.suffix = None # The detail initkwarg is reserved for introspecting the viewset type. cls.detail = None # Setting a basename allows a view to reverse its action urls. This # value is provided by the router through the initkwargs. cls.basename = None # actions must not be empty if not actions: raise TypeError("The `actions` argument must be provided when ""calling `.as_view()` on a ViewSet. For example ""`.as_view({'get': 'list'})`") # sanitize keyword arguments for key in initkwargs: if key in cls.http_method_names: raise TypeError("You tried to pass in the %s method name as a " "keyword argument to %s(). Don't do that." % (key, cls.__name__)) if not hasattr(cls, key): raise TypeError("%s() received an invalid keyword %r" % ( cls.__name__, key)) # name and suffix are mutually exclusive if 'name' in initkwargs and 'suffix' in initkwargs: raise TypeError("%s() received both `name` and `suffix`, which are ""mutually exclusive arguments." % (cls.__name__)) def view(request, *args, **kwargs): self = cls(**initkwargs) if 'get' in actions and 'head' not in actions: actions['head'] = actions['get'] # We also store the mapping of request methods to actions, # so that we can later set the action attribute. # eg. `self.action = 'list'` on an incoming GET request. self.action_map = actions # Bind methods to actions # This is the bit that's different to a standard view for method, action in actions.items(): handler = getattr(self, action) setattr(self, method, handler) self.request = request self.args = args self.kwargs = kwargs # And continue as usual return self.dispatch(request, *args, **kwargs) # take name and docstring from class update_wrapper(view, cls, updated=()) # and possible attributes set by decorators # like csrf_exempt from dispatch update_wrapper(view, cls.dispatch, assigned=()) # We need to set these on the view function, so that breadcrumb # generation can pick out these bits of information from a # resolved URL. view.cls = cls view.initkwargs = initkwargs view.actions = actions return csrf_exempt(view)使用ViewSet通常并不方便，因为list、retrieve、create、update、destory等action
方法都需要自己编写，而这些方法与前面讲过的Mixin扩展类提供的方法同名，所以我们可以通过继承Mixin扩展类来复用这些方法而无需自己编写。
ModelViewSet继承自 GenericViewSet，同时包括了ListModelMixin、RetrieveModelMixin、CreateModelMixin、UpdateModelMixin、DestoryModelMixin。
1、ModelViewSet源码
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. """ passReadOnlyModelViewSet承自 GenericViewSet，同时包括了ListModelMixin、RetrieveModelMixin。
1、ReadOnlyModelViewSet源码
class ReadOnlyModelViewSet(mixins.RetrieveModelMixin, mixins.ListModelMixin, GenericViewSet): """ A viewset that provides default `list()` and `retrieve()` actions. """ passGenericViewSet继承ViewSetMixin、GenericAPIView
继承ViewSetMixin：实现了在调用as_view()时传入字典{“http请求”：“视图方法”}的映射处理工作，如
{‘get’:’list’，
‘post’:‘create’,
‘put’:‘update’,
‘delete’:‘destory’}，
继承了GenericAPIView：实现了分页、限流、过滤功能
class GenericViewSet(ViewSetMixin, generics.GenericAPIView): """ The GenericViewSet class does not provide any actions by default, but does include the base set of generic view behavior, such as the `get_object` and `get_queryset` methods. """ pass
来源地址：https://blog.csdn.net/YZL40514131/article/details/126598807
