Rails Bootstrap 3 Flash message helper

flash_helper.rb

module FlashHelper

  # Helper for Bootstrap styled flash messages.
  def bootstrap_class_for(flash_type)
    case flash_type
      when 'success'
        'alert alert-success alert-dismissable fade in'   # Green
      when 'error'
        'alert alert-danger alert-dismissable fade in'    # Red
      when 'alert'
        'alert alert-warning alert-dismissable fade in'   # Yellow
      when 'notice'
        'alert alert-info alert-dismissable fade in'      # Blue
      else
        flash_type.to_s
    end
  end

  def flash_messages(options = {})
    @layout_flash = options.fetch(:layout_flash) { true }
    @flash_close = options.fetch(:closable) { true }

    capture do
      flash.each do |name, msg|

        concat(content_tag(:div, class: bootstrap_class_for(name), role: 'alert') do
          if @flash_close
          concat(button_tag(type: :button, name: nil, class: :close, data: { dismiss: 'alert'}) do
            concat content_tag(:span, '×'.html_safe, :'aria-hidden' => 'true')
            concat content_tag(:span, 'Close', class: 'sr-only')
          end)
          concat msg
          else
          concat msg
          end
        end)

      end
    end
  end

  def show_layout_flash?
    @layout_flash.nil? ? true: @layout_flash
  end

end

Usage:
application.html.erb

<%= flash_messages closable: true if show_layout_flash? %>

If you would like to show errors elsewhere in your HTML

Example for devise:
views/devise/sessions/new.html.erb

<%= flash_messages layout_flash: false, closable: false %>