一段时间后登录时 Flask 出现 SESSION_COOKIE_NAME 错误

Question

直到最近，一切都很好，但现在我的网站不断给出“SESSION_COOKIE_NAME”和“NoneType”对象没有属性“修改”错误。但令人感兴趣的是，如果我更改代码，错误如何消失一段时间并不重要。请有识之士帮忙解答一下

以下是代码中最重要的部分：

import os
import plotly.express as px
import cs50
import pandas as pd
import json
import plotly
import requests
from dotenv import load_dotenv
from cs50 import SQL
from flask import Flask, flash, redirect, render_template, request, session, jsonify, url_for
from flask_session import Session
from tempfile import mkdtemp
from werkzeug.security import check_password_hash, generate_password_hash
from datetime import datetime
from plotly.graph_objs import Figure, Scatter

from helpers import apology, login_required, lookup, usd

# Configure application
app = Flask(__name__)

load_dotenv()

# Configure session to use filesystem (instead of signed cookies)
app.config["TEMPLATES_AUTO_RELOAD"] = True

app.config["SESSION_TYPE"] = "filesystem"
app.config["SESSION_FILE_DIR"] = mkdtemp()
app.config["SESSION_PERMANENT"] = False
app.config["SESSION_USE_SIGNER"] = True
app.config["SECRET_KEY"] = os.urandom(24)
app.config["SESSION_COOKIE_NAME"] = 'session_cookie_name'

Session(app)

# I'm also using part of code like this in my app
    session["user_id"] = rows[0]["id"]
    # or
    user_id = session["user_id"]

if __name__ == '__main__':
    app.run

这里是错误日志：

Traceback (most recent call last):
  File "/usr/local/lib/python3.11/site-packages/flask/app.py", line 2527, in wsgi_app
    ctx.push()
  File "/usr/local/lib/python3.11/site-packages/flask/ctx.py", line 375, in push
    self.session = session_interface.open_session(self.app, self.request)
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/flask_session/sessions.py", line 329, in open_session
    sid = request.cookies.get(app.session_cookie_name)
                              ^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/flask/app.py", line 287, in session_cookie_name
    warnings.warn(
DeprecationWarning: 'session_cookie_name' is deprecated and will be removed in Flask 2.3. Use 'SESSION_COOKIE_NAME' in 'app.config' instead.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.11/site-packages/flask/app.py", line 1847, in finalize_request
    response = self.process_response(response)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/flask/app.py", line 2343, in process_response
    self.session_interface.save_session(self, ctx.session, response)
  File "/usr/local/lib/python3.11/site-packages/flask_session/sessions.py", line 353, in save_session
    if session.modified:
       ^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'modified'

我只是没有尝试完全删除它并更改名称。登录帐户一段时间后会出现此问题，当尝试搜索该网站时，它只是给出此错误而不是 POST 请求。

Answer 1

您的输出由两部分组成，第一部分是警告。 而不是

sid = request.cookies.get(app.session_cookie_name)

修改为

 sid = request.cookies.get(app.config["SESSION_COOKIE_NAME"] )

和

if session.modified:

会话似乎未初始化或没有.modified密钥。