Flask：当flash（）在@ app.before_request中时，获取随机重复的flash消息 [英] Flask: getting random repeated flash messages when flash() is in @app.before_request

问题描述

当我在@ app.before_request中使用flash（）时，我得到了一个随机的重复条目。重复刷新页面会给我1到4个重复的消息。

没有任何重定向。

我的代码很简单：
$ b $ pre $ if app.config ['INSTANCE'] =='DEV'：
flash（这个数据来自开发数据库）


另外，我没能弄清楚如何通过get_flashed_messages（）来访问/修改flash（）似乎追加到模板中的消息数组。任何人都知道如何？

解决方案

您可以通过访问等待消息列表flashblock = session.get '_flashes'，[]）。您可以在Github上查看代码

请注意，为什么您会收到一些闪烁的消息，这是因为您提出了多个请求（但可能不知道）。您的网页浏览器可能要求 favicon.ico 这是一个请求，所以会导致一个闪光等。如果您在调试模式下运行，您的控制台窗口将显示所有的请求正在处理。例如，在Chrome中加载一个简单的烧瓶示例会导致显示：

  127.0.0.1  -   -  [21 / Jun / 2013 16 ：35：05]GET / HTTP / 1.1200  -  
 127.0.0.1  -   -  [21 / Jun / 2013 16:35:05]GET /favicon.ico HTTP / 1.1404  -  
  

其中一个是我要求查看主页，另一个是Chrome要求的favicon（它被告知它doesn不存在）。

When i use flash() in @app.before_request, I get what seems like a random number of repeated entries. Refreshing the page over and over will give me between 1 and 4 repeated messages.

There aren't any redirects.

My code is simply:

   if app.config['INSTANCE'] == 'DEV':
       flash("This data is from the development DB")

Alternatively, I wasn't able to figure out how to access/modify the array of messages that flash() seems to append to other than in the template via get_flashed_messages(). Anyone know how?

解决方案

You can access the list of waiting messages via flashes = session.get('_flashes', []). You can view the code on Github

On the note of why you're getting a few messages flashing, it's because you're making multiple requests (but probably don't know it). Your web-browser is probably asking for favicon.ico which is a request, so causes a flash, etc. If you're running in debug mode, your console window will show all the requests being handled. For example loading a simple flask example in Chrome causes this to show:

127.0.0.1 - - [21/Jun/2013 16:35:05] "GET / HTTP/1.1" 200 -
127.0.0.1 - - [21/Jun/2013 16:35:05] "GET /favicon.ico HTTP/1.1" 404 -

One is my request to view the homepage, the other is Chrome asking for the favicon (and it being told it doesn't exist).

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