title_helper.rb

def title_tag(title_string)
  controller_str = controller.controller_name.capitalize! || 'Home'
  action_str = controller.action_name.capitalize || 'Index'
  title_string.gsub("%controller%",controller_str).gsub("%action%",action_str)
  content_tag(:title,title_string)
end

title_view.html.erb

#source from http://blog.wetherubyists.com/post/396588375/handling-title-tags-in-rails

<%= title_tag("The Rubyists | %controller% > %action%") %>