Discourse is rails application specifically built as a forum application which has gained a lot of momentum recently. Usually you want to integrate discourse with your main rails app, namely on a subdomain of its own, so one of the hottest topics is sharing session between the two apps.
Sharing session between rails 4 apps is rather simple, basically you have to set the same session cookie name and domain scope in
YourApp::Application.config.session_store :cookie_store, key: '_your_app', domain: '.yourdomain.com'
and you have to set the session secret to the same value in
secret_token.rb, for example:
YourApp::Application.config.secret_key_base = 'some_very_long_random_string'
The caveat with discourse is that
secret_token.rb file by default uses
Discourse::Application.config.secret_token = so make sure you replace the
.secret_token = part with
.secret_key_base =, failing that it will not work properly 😉