创建一个 Viewset Mixin/Baseclass 来继承 viewset-action

Question

我有一个网站，本质上是我正在参与的 DnD 活动的 wiki。因此，它包含有关生物、角色、位置等的文章。我想使用 Viewset 轻松访问它们，并希望使用 Viewset 操作（与自定义路由器一起）能够查找单个记录，而不是通过 pk，而是通过各种查询参数。

我已经有一些适用于此的东西，现在我想对其应用一些继承，以免重复自己。我想做的是这样的：

class WikiBaseViewset (viewsets.ModelViewSet):

    detail_with_params_url_pattern_suffix: str

    @action(detail=True, url_name="detail-params", url_path=detail_with_params_url_pattern_suffix)

    def detail_through_params(self, request, **kwargs):

        if self.detail_with_params_url_pattern_suffix == "":

            raise InvalidViewsetURLException("URL of view 'detail_through_params' of WikiBaseViewset is not defined!")

        model = self.serializer_class.Meta.model

        instance = get_object_or_404(model, **kwargs)

        serializer = self.get_serializer(instance)

        return Response(serializer.data)

class CharacterSerializer (serializers.HyperlinkedModelSerializer):

    class Meta:

        model = wiki_models.Character

        fields = '__all__'

class CharacterViewSet(WikiBaseViewset):

    """Called with URLs: character, character/<str: name>"""

    serializer_class = CharacterSerializer

    queryset = wiki_models.Character.objects.all()

    detail_with_params_url_pattern_suffix = "(?P<name__iexact>.+)"

然而，我正在努力解决装饰器绝对需要基类中的 URL 参数这一事实。否则，由于 NameError 抱怨未定义，代码将无法编译detail_with_params_url_pattern_suffix。如果您要在基类中进行设置detail_with_params_url_pattern_suffix=""，以便在编译代码时不出现错误，那仍然没关系，因为到目前为止我的实验中的装饰器仍然从 not 获取该变量的WikiBaseViewset值CharacterViewSet。

我如何重写我的 BaseClass 才能使其正常工作？还有办法吗？

Answer 1

对于这个问题我没有找到完全令人满意的答案，但最终默许了这个解决方案，因为它比复制粘贴更好。您可能无法继承视图集操作，但您肯定可以继承各个方法，然后在子级中覆盖它们并在顶部抛出一个装饰器。这导致了这个结构：class WikiBaseViewset (viewsets.ModelViewSet):&nbsp; &nbsp; detail_with_params_url_pattern_suffix: str&nbsp; &nbsp; def detail_through_params(self, request, **kwargs):&nbsp; &nbsp; &nbsp; &nbsp; model = self.serializer_class.Meta.model&nbsp; &nbsp; &nbsp; &nbsp; instance = get_object_or_404(model, **kwargs)&nbsp; &nbsp; &nbsp; &nbsp; serializer = self.get_serializer(instance)&nbsp; &nbsp; &nbsp; &nbsp; return Response(serializer.data)class CharacterSerializer (serializers.HyperlinkedModelSerializer):&nbsp; &nbsp; class Meta:&nbsp; &nbsp; &nbsp; &nbsp; model = wiki_models.Character&nbsp; &nbsp; &nbsp; &nbsp; fields = '__all__'class CharacterViewSet(WikiBaseViewset):&nbsp; &nbsp; """Called with URLs: character, character/<str: name>"""&nbsp; &nbsp; serializer_class = CharacterSerializer&nbsp; &nbsp; queryset = wiki_models.Character.objects.all()&nbsp; &nbsp; @action(detail=True, url_name="detail-params", url_path="(?P<name__iexact>.+)")&nbsp; &nbsp; def detail_through_params(self, request, **kwargs):&nbsp; &nbsp; &nbsp; &nbsp; return super().detail_through_params(request, **kwargs)