'Babel' object has no attribute 'load_locale': Babelex not compatible when app is using flask_babel

[mvhconsult]

I am building an app and using flask_babel for translations.
Trying out your security version (which seems the only one maintained, thanks) but am hitting an issue with first use:

Been reading up a bit and I think this is due to the impossibility for the flask-babels to work from two installations (domains):
mrjoes/flask-babelex#16

I encountered this fork, which promises to be able to use more than one domain:
https://flask-babelplus.readthedocs.io/en/latest/
https://github.com/sh4nks/flask-babelplus

Have you tried it with that one instead of Babelex?

Part of the error generated:

''' File "/home/michelv/.local/share/virtualenvs/localshare-CVNR5Qnw/lib/python3.7/site-packages/flask/app.py", line 1821, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/home/michelv/.local/share/virtualenvs/localshare-CVNR5Qnw/lib/python3.7/site-packages/flask/_compat.py", line 39, in reraise
raise value
File "/home/michelv/.local/share/virtualenvs/localshare-CVNR5Qnw/lib/python3.7/site-packages/flask/app.py", line 1950, in full_dispatch_request
rv = self.dispatch_request()
File "/home/michelv/.local/share/virtualenvs/localshare-CVNR5Qnw/lib/python3.7/site-packages/flask/app.py", line 1936, in dispatch_request
return self.view_functionsrule.endpoint
File "/home/michelv/.local/share/virtualenvs/localshare-CVNR5Qnw/lib/python3.7/site-packages/flask_login/utils.py", line 271, in decorated_view
return current_app.login_manager.unauthorized()
File "/home/michelv/.local/share/virtualenvs/localshare-CVNR5Qnw/lib/python3.7/site-packages/flask_login/login_manager.py", line 162, in unauthorized
flash(self.localize_callback(self.login_message),
File "/home/michelv/.local/share/virtualenvs/localshare-CVNR5Qnw/lib/python3.7/site-packages/werkzeug/local.py", line 375, in
call = lambda x, *a, **kw: x._get_current_object()(*a, **kw)
File "/home/michelv/.local/share/virtualenvs/localshare-CVNR5Qnw/lib/python3.7/site-packages/flask_babelex/init.py", line 533, in gettext
t = self.get_translations()
File "/home/michelv/.local/share/virtualenvs/localshare-CVNR5Qnw/lib/python3.7/site-packages/flask_babelex/init.py", line 510, in get_translations
locale = get_locale()
File "/home/michelv/.local/share/virtualenvs/localshare-CVNR5Qnw/lib/python3.7/site-packages/flask_babelex/init.py", line 224, in get_locale
locale = babel.load_locale(rv)
AttributeError: 'Babel' object has no attribute 'load_locale''''

[jwag956]

I havent seen babelplus before - and looks like he just re-started updating that package - that is great news since Flask-BabelEx has basically been abandoned.
In your traceback however - it is showing you are using flask_babelex - is is possible you have both packages installed?

[mvhconsult]

I have flask-babel installed, trying to move to this security-too repo but then stuck at finding out what to do with my translations (which I do not really like to change as well).
The babelex is coming from this Security-too installation right?

pipenv graph

    - email-validator [required: >=1.0.5, installed: 1.1.1]
      - dnspython [required: >=1.15.0, installed: 1.16.0]
      - idna [required: >=2.0.0, installed: 2.9]
    - Flask [required: >=1.0.2, installed: 1.1.2]
      - click [required: >=5.1, installed: 7.1.2]
      - itsdangerous [required: >=0.24, installed: 1.1.0]
      - Jinja2 [required: >=2.10.1, installed: 2.11.2]
        - MarkupSafe [required: >=0.23, installed: 1.1.1]
      - Werkzeug [required: >=0.15, installed: 1.0.1]
    - Flask-BabelEx [required: >=0.9.3, installed: 0.9.4]
...

[jwag956]

Ahh yes - flask-security needs a flask-babelex interface (which as you point out has been problematic since it isn't supported). Flask-Babel isn't enough since it doesn't support multiple domains. Multiple folks have tried to cajole the Flask-Babel maintainers to backport the domain changes - but so far they haven't.

Here's something to try - after installing flask-security-too - uninstall Flask-BabelEx and install Flask-BabelPlus.

I haven't really looked into how to support flask-babel directly (which might require the application to copy all the Flask-Security translations into their own. Any ideas would be welcome - I would love to get rid of the Flask-BabelEx dependency..

[mvhconsult]

What works (on a dev environment, so not really heavily tested) is to uninstall flask-babel and flask-babelex
Install flask-babelplus (I set up my own domain for my own app)
Then adjust flask_security core.py to call babelplus
and
adjust i18n.py in flask_wtf to call flask_babelplus

So not really going back to babel, but getting it working with a recently updated module.

[jwag956]

Thanks! I'll look into making the change so applications can choose babelEx or bableplus...

[jwag956]

Flask-Babel just released with support for the Domain feature from Flask-BabelEx... Yea!

4.0 will use that.

[mvhconsult]

Great. It would still be nice though to inc;lude an optional load of babelplus. Something like
try
...
except ImportError:
import flask-babelplus