Register flash types in Rails

add_flash_types_snippet.md

application_controller.rb

class ApplicationController
  add_flash_types :primary, :success, :warning, :danger, :info
end

layout.html.erb

<% flash.each do |name, msg| %>
  <%= content_tag :div, msg, class: "alert alert-#{name}" %>
<% end %>

Shortcut in controllers ..

redirect_to posts_url, success: 'post was created !'