demarches-normaliennes/app/views/layouts/_flash_messages.html.haml

#flash_messages
  - if flash.any?
    #flash_message.center
      - flash.each do |key, value|
        - sticky = defined?(sticky) ? sticky : false
        - if value.class == Array
          .alert{ class: flash_class(key, sticky) }
            - value.each do |message|
              = sanitize(message)
              %br
        - else
          .alert{ class: flash_class(key, sticky) }
            = sanitize(value)