如何让基于类的视图mixin的dispatch方法首先触发？

Question

我有一个基于 Django 类的视图，它覆盖了

dispatch

方法。

我想向这个基于类的视图添加一个混合。

mixin 还重写了

dispatch

方法。

是否可以在基于类的视图自定义

dispatch

方法之前执行 mixins

dispatch

方法？如果是这样，我将如何实施？

目前，当我实现我的解决方案时，如以下示例所示，CustomerCreateView 的自定义

dispatch

方法首先触发，这不是我需要的。

class MyMixin(LoginRequiredMixin):
    def dispatch(self, request, *args, **kwargs):
        ....
    return super().dispatch(request, *args, **kwargs)


class CustomerCreateView(MyMixin, CreateView):
    model = Customer
    form_class = CreateCustomerForm
    title = "Add a New Customer"

    def dispatch(self, request, *args, **kwargs):
        ...
        return super().dispatch(request, *args, **kwargs)

Answer 1

MyMixin 是 CustomerCreateView 的超类。所以

CustomerCreateView.dispatch

总是会首先被调用。但您可以在运行该方法的其余部分之前自己调用

MyMixin.dispatch

：

class CustomerCreateView(MyMixin, CreateView):
    model = Customer
    form_class = CreateCustomerForm
    title = "Add a New Customer"

    def dispatch(self, request, *args, **kwargs):
        # Call MyMixin.dispatch
        response = super().dispatch(request, *args, **kwargs)
        # Do other stuff
        ...
        return response

或者，您可以重新安排继承：

class MyMixin(LoginRequiredMixin):
    def dispatch(self, request, *args, **kwargs):
        ...
        return super().dispatch(request, *args, **kwargs)


class CustomerCreateView(CreateView):
    model = Customer
    form_class = CreateCustomerForm
    title = "Add a New Customer"

    def dispatch(self, request, *args, **kwargs):
        ...
        return super().dispatch(request, *args, **kwargs)

class CorrectView(MyMixin, CustomerCreateView):
    # MyMixin.dispatch will be called first