flash_helper.rb
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	module FlashHelper

	# Generate html flash messages based on bootstrap alerts.
	def flash_messages
	flash.each do \|msg_type, message\|
	concat(
	content_tag(:div, message, class: "alert #{bootstrap_class_for(msg_type)} fade in") do
	concat content_tag(:button, 'x', class: 'close', data: { dismiss: 'alert' })
	concat message
	end
	)
	end

	nil
	end

	private

	def bootstrap_class_for(flash_type)
	{
	success: 'alert-success',
	error: 'alert-danger',
	alert: 'alert-warning',
	notice: 'alert-info'
	}.fetch(flash_type.to_sym, flash_type.to_s)
	end
	end