app/helpers/application_helper.rb
module ApplicationHelper
include UrlHelpers
def current_host
request.host
end
def per_page_selector
per_page = params[:per_page] || configus.pagination.default_per_page
select_tag :per_page, options_for_select(configus.pagination.per_page_list, per_page), :class => "per_page_selector"
end
end