How build a breadcrumbs in rails 4

Seriously, I have no idea where to start. How do I implement a helper breadcrums without using gems? I tried some gems, but I preffer make a simple helpe. Exist someone or some tutorial? I not found this =/

Thanks!

My solution:

navigation_helper.rb

module NavigationHelper
  def ensure_navigation
    @navigation ||= [ { :title => 'Home', :url => '/' } ]
  end

  def navigation_add(title, url)
    ensure_navigation << { :title => title, :url => url }
  end

  def render_navigation
    render :partial => 'navigation', :locals => { :nav => ensure_navigation }
  end
end

_navigation.html.erb

  <ol class="breadcrumb">
    <% nav.each do |n| %>
      <% unless n.equal? nav.last %>
        <li><%= link_to n[:title], n[:url] %></li>
      <% else %>
        <li><%= n[:title] %></li>
      <% end %>
    <% end %>
  </ol>

application.html.erb

<%= render_navigation %>

And any view:

<% content_for :title, 'My Page Title' %>
    <% navigation_add @something.anything, '#' %>