Python 确保TemplateView'；中的代码逻辑的常见技术是什么；获取一次执行的上下文数据？

目前，我有以下付款按钮

<a href="https://localhost/subscribe/?payload_nonce=token123">PAY NOW</a>

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我想知道，确保TemplateView的get_context_数据中的代码逻辑执行一次的常用技术是什么？

这里真正的问题是

正确的解决方案是使用一个只接受POST请求的专用视图（这意味着您需要一个HTML表单而不是一个链接），该视图将处理步骤1和2以及。当然，您必须将结果（以及相关的令牌）存储在某个地方，以便您可以1。避免为同一令牌和2重新发送两次付款。在模板视图的

get\u context\u data

方法中检索与令牌关联的结果

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注意：当然，您也可以在同一个视图中处理GET和POST请求，但是

TemplateView

可能不是最佳选择（实际上，除非您需要继承，否则基于类的视图很少是最佳选择-基于函数的视图通常要简单得多）

多亏了布鲁诺·德舒利尔。这就是如何进行代码重构

from django.views.generic import TemplateView
from django.views.generic import View

class SubscribeView(View):
    def post(self, request):
        # Step 1: Get token input from user
        #
        payload_nonce = self.request.POST.get("payload_nonce")


        # Step 2: Payment gateway processes the 
        #         received token, and return success/fail result.
        ...
        ...
        ##############################
        # Submit it to payment gateway
        ##############################
        ...
        ...

        # Redirect to SubscribeDoneView, for page rendering purpose.
        return redirect(reverse('subscribe_done') + query_string)


class SubscribeDoneView(TemplateView):
    template_name = 'subscribe_done.html'

    def get_context_data(self, **kwargs):
        # Call the base implementation first to get a context
        context = super(SubscribeDoneView, self).get_context_data(**kwargs)

        # Step 3: Display success/fail result to user.
        #
        is_success = (self.request.GET.get('is_success') == 'True')
        message = self.request.GET.get('message')

        context['is_success'] = is_success
        if is_success is False and message is not None:
            context['message'] = message

        return context

from django.views.generic import TemplateView
from django.views.generic import View

class SubscribeView(View):
    def post(self, request):
        # Step 1: Get token input from user
        #
        payload_nonce = self.request.POST.get("payload_nonce")


        # Step 2: Payment gateway processes the 
        #         received token, and return success/fail result.
        ...
        ...
        ##############################
        # Submit it to payment gateway
        ##############################
        ...
        ...

        # Redirect to SubscribeDoneView, for page rendering purpose.
        return redirect(reverse('subscribe_done') + query_string)


class SubscribeDoneView(TemplateView):
    template_name = 'subscribe_done.html'

    def get_context_data(self, **kwargs):
        # Call the base implementation first to get a context
        context = super(SubscribeDoneView, self).get_context_data(**kwargs)

        # Step 3: Display success/fail result to user.
        #
        is_success = (self.request.GET.get('is_success') == 'True')
        message = self.request.GET.get('message')

        context['is_success'] = is_success
        if is_success is False and message is not None:
            context['message'] = message

        return context