Routing

Redirect

Current page

redirect_back(fallback_location: root_path)

From StackOverflow

Global error handling

https://stackoverflow.com/questions/8495151/ruby-on-rails-3-1-global-exception-handler https://wyeworks.com/blog/2016/1/12/improvements-to-error-responses-in-rails-5-api-mode

Flash

https://coderwall.com/p/-2klvg/custom-flash-helper-in-rails4

Sources: