I'm building a review site using ruby on rails. When I code the drop-down menu, included in the code below, it won't expand. I know from changing the code that the options are there and work, only the dropdown won't expand.
<body>
<nav class="navbar navbar-default">
<div class="container">
<div class="navbar-header">
<%= link_to "NDLabClub", root_path, class: "navbar-brand" %>
</div>
<ul class="nav navbar-nav">
<li><%= link_to "Sign Up", new_user_registration_path %></li>
<% if user_signed_in? %>
<li><%= link_to "Sign Out", destroy_user_session_path, method: :delete %></li>
<% else %>
<li><%= link_to "log In", new_user_session_path %></li>
<% end %>
</ul>
<ul class="nav navbar-nav navbar-right">
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button"
aria-expanded="false">Categories <span class="caret"></span></a>
<ul class="dropdown-menu" role="menu">
<% Category.all.each do |category| %>
<li>
<%= link_to category.breed, dogs_path(category: category.breed), class: "link" %>
</li>
<% end %>
</ul>
</li>
<% if user_signed_in? %>
<li><%= link_to "Add Dog", new_dog_path%></li>
<% end %>
</ul>
</div>
</nav>
<p class="notice"><%= notice %></p>
<p class="alert"><%= alert %></p>
<%= yield %>