You can just add each Rails framework to your Gemfile and be done. `require &quot;rails&#x2F;all&quot;` catches load errors, so you don&#x27;t need to require the frameworks manually in application.rb.<p><a href="https:&#x2F;&#x2F;gist.github.com&#x2F;nateberkopec&#x2F;1184c81a92c10d84d779" rel="nofollow">https:&#x2F;&#x2F;gist.github.com&#x2F;nateberkopec&#x2F;1184c81a92c10d84d779</a>