Flask Framework Cookbook - Second Edition

How to do it...

Observe the following steps to understand how to implement language switching globally:

1. First, modify all the URL rules to accommodate an extra URL part. @catalog.route('/') will become @catalog.route('/<lang>/'), and @catalog.route('/home') will become @catalog.route('/<lang>/home'). Similarly, @catalog.route('/product-search/<int:page>') will become @catalog.route('/<lang>/product-search/<int:page>'). The same needs to be done for all the URL rules.
2. Now, add a function that will add the language passed in the URL to the global proxy object, g:

@app.before_request 
def before(): 
    if request.view_args and 'lang' in request.view_args: 
        g.current_lang = request.view_args['lang'] 
        request.view_args.pop('lang') 

This method will ...