Fix: Set flask version to the last one with session_cookie_name (v2.2.5)

[Saigesp]

Problem

When running the application, it throws a 500 error:

Traceback (most recent call last):
  File "/home/santi/.virtualenvs/xero-python/lib/python3.10/site-packages/flask/app.py", line 2189, in wsgi_app
    ctx.push()
  File "/home/santi/.virtualenvs/xero-python/lib/python3.10/site-packages/flask/ctx.py", line 377, in push
    self.session = session_interface.open_session(self.app, self.request)
  File "/home/santi/.virtualenvs/xero-python/lib/python3.10/site-packages/flask_session/sessions.py", line 319, in open_session
    sid = request.cookies.get(app.session_cookie_name)
AttributeError: 'Flask' object has no attribute 'session_cookie_name'

Cause

When installing the application the latest version of Flask is installed, but as of version 2.3.0 flask removed the session_cookie_name and other properties.

The session_cookie_name, send_file_max_age_default, use_x_sendfile,
propagate_exceptions, and templates_auto_reload properties on app are removed.

Flask changelog for version 2.3.0 here.

Solution

Set the flask version to 2.2.5 in requirements.txt

flask==2.2.5

[hui-jie-lim]

encountered similar issues. If it helps, I can verify that fix will solve this problem.