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什么是常见的技术,以确保TemplateView的get-context数据中的代码逻辑被执行一次?

django python

Cheok Yan Cheng · 技术社区 · 6 年前

目前,我有以下付款按钮。

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

当用户点击链接时,下面是场景背后发生的事情。

从用户获取令牌输入。
支付网关处理接收到的令牌,并返回成功/失败结果。
向用户显示成功/失败结果。

我希望,当用户单击浏览器中的“刷新”按钮时,将跳过步骤1和步骤2。

我们不希望用户重复付款。

但是,只显示以前的网关成功/失败结果。

这里是 TemplateView 代码。

class SubscribeView(TemplateView):
    template_name = 'subscribe.html'

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

        # Step 1: Get token input from user
        #
        payload_nonce = self.request.GET.get('payload_nonce')


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


        # Step 3: Display success/fail result to user.
        #
        context['is_success'] = result.is_success
        context['message'] = result.message

        return context

我可以知道,什么是常见的技术,以确保TemplateView的get-context数据中的代码逻辑被执行一次吗?

2 回复 | 直到 6 年前

bruno desthuilliers 6 年前

you are updating state in an operation that should be idempotent

then redirect to your template view get_context_data

TemplateView

Cheok Yan Cheng 6 年前

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