ref : https://kmywblog.wordpress.com/2015/10/13/
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| # app/helpers/application_helper
module ApplicationHelper
def render_active(title,path)
c = current_page?(path) ? "active" : ""
content_tag(:li, link_to( title, path ), :class => c )
end
end
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| # views
<%= render_active( 'Home', root_path ) %>
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