app/views/admin/roles/index.html.erb
<%- add :about, "User Management" %>
<%- add :menu, "Add new role" => new_admin_role_path if can?(:create, Role) %>
<%- add :menu, "Back to Admin Panel" => admin_path if can?(:administer, Sequencescape) %>
<div class="page-header"><h1>Listing Roles</h1></div>
<ul>
<% @roles.each do |role| -%>
<li>
<h3><%= role.humanize %></h3>
<p><strong><%= link_to "Show all users that are #{role}s", admin_role_users_path(role) %></strong></p>
</li>
<% end %>
</ul>