Current Page Active

current_page.rb

module ApplicationHelper
 def is_active?(link_path)
  current_page?(link_path) ? "active" : ""
 end
end

<li class="<%= is_active?(some_path) %>">
  <%= link_to "name path", some_path %>
</li>

====================================
module ApplicationHelper
  def cp(path)
    current_route = Rails.application.routes.recognize_path(path)
    "current" if current_page?(path) or params[:controller] == current_route[:controller]
  end
end

<nav id="menu-panel">
  <%= link_to 'SERVICES', services_path, class: cp('/services') %>
  <%= link_to 'FACILITIES', facilities_path, class: cp('/facilities') %>
  <%= link_to 'ABOUT', about_path, class: cp('/about') %>
  <%= link_to 'CAREERS', careers_path, class: cp(careers_path) %>
  <%= link_to 'BLOG', blog_index_path, class: cp(blog_index_path) %>
  <%= link_to 'CONTACT', contact_path, class: cp('/contact') %>
  <a href="#" id="close-menu-panel"><b>CLOSE</b></a>
</nav>