app/views/layouts/_nav.html.erb
<nav class="navbar navbar-default">
<div class="container-fluid">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#top-nav" aria-expanded="false">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<%= link_to fa_icon("hourglass-half", text: "Hourglass"), root_path, class: "navbar-brand" %>
</div>
<div class="collapse navbar-collapse" id="top-nav">
<ul class="nav navbar-nav navbar-right">
<%= content_tag :li, class: ("active" if params[:controller] == "users") do %>
<%= link_to fa_icon("user", text: "Users"), users_path %>
<% end %>
<%= content_tag :li, class: ("active" if params[:controller] == "teams") do %>
<%= link_to fa_icon("group", text: "Teams"), teams_path %>
<% end %>
</ul>
</div>
</div>
</nav>