在烧瓶中发布/重定向/获取模式

本文介绍了在烧瓶中发布/重定向/获取模式的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我的玩具应用程序的查看功能是:

The view function of my toy app was:

@app.route('/', methods=['GET', 'POST']) def index(): name = None form = NameForm() if form.validate_on_submit(): name = form.name.data form.name.data = '' return render_template('index.html', form=form, name=name)

当我使用PRG时，它看起来像这样:

And it looks like this when I use PRG:

@app.route('/', methods=['GET', 'POST']) def index(): form = NameForm() if form.validate_on_submit(): session['name'] = form.name.data return redirect(url_for('index')) return render_template('index.html', form=form, name=session.get('name'))

如您所见，form.name.data = ''行用于在第一个版本中清除输入字段，但在第二个版本中则不需要.我以为Flask-WTF会自动将StringField中的文本传递到新的form实例中，但是由于某些原因，它没有.

As you can see, the form.name.data = '' line is used to clear the input field in the first version, but it's not needed in the second version. I thought Flask-WTF would automatically pass the text in StringField into the new form instance, but for some reasons, it didn't.

我的问题是:为什么在使用PRG时，不同请求之间的form.name.data不再可用?

My question is: Why form.name.data is no longer available between different requests when I use PRG?

推荐答案

由于它是一个全新的请求，它无法在重定向中传递任何内容.

It can't pass anything on a redirect, as it is a completely new request.