How to get Twitter-Bootstrap navigation to show active link?

Question

I\'m not understanding how Twitter Bootstrap does active links for the navigation. If I have a regular navigation like this (with ruby on rails linking):

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Answer 1

I used a helper to implement this in the style of Rails' form helpers.

In a helper (e.g. app/helpers/ApplicationHelper.rb):

def nav_bar
  content_tag(:ul, class: "nav navbar-nav") do
    yield
  end
end

def nav_link(text, path)
  options = current_page?(path) ? { class: "active" } : {}
  content_tag(:li, options) do
    link_to text, path
  end
end

Then, in a view (e.g. app/views/layouts/application.html.erb):

<%= nav_bar do %>
  <%= nav_link 'Home', root_path %>
  <%= nav_link 'Posts', posts_path %>
  <%= nav_link 'Users', users_path %>
<% end %>

This example produces (when on the 'users' page):

  
Home
  
Posts
  
Users