device redirect back when user login

	class ApplicationController < ActionController::Base
	protect_from_forgery with: :exception
	def after_sign_in_path_for(resource)
	sign_in_url = url_for(:action => 'new', :controller => 'sessions', :only_path => false, :protocol => 'http')
	if request.referer == sign_in_url
	super
	else
	stored_location_for(resource) || request.referer || root_path
	end
	end
	end

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