试图刷新消息引发异常 [英] Trying to flash a message raises an exception

问题描述

我想用 flash 来显示讯息，但这样做会引发异常。下面的代码演示了这个错误，并且如果调用 flash 被删除，那么这个工作正常。如何解决这个错误？

I want to use flash to show a message, but doing so raises an exception. The code below demonstrates the error, and works fine if the call to flash is removed. How do I fix this error?

from flask import Flask, flash

app = Flask(__name__)

@app.route('/')
def index():
    flash('Entered')
    return 'Completed'

app.run(debug=True)

RuntimeError: the session is unavailable because no secret key was set. Set the secret_key on the application to something unique and secret.

推荐答案

键，所以会话不可用。会话依靠一个秘密密钥来签署cookie防止篡改。消息闪烁依赖于会话。

As the error says, you have not set a secret key, so the session is unavailable. The session relies on a secret key to sign the cookie prevent tampering. Message flashing relies on the session.

设置 SECRET_KEY 配置项来解决这个错误。 b
$ b

Set the SECRET_KEY config item to fix this error.

# set as part of the config
SECRET_KEY = 'many random bytes'

# or set directly on the app
app.secret_key = 'many random bytes'

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