app/views/admin/users/index.text.erb
<% @users.group_by(&:role).each do |role, users| %>
<%= role %>
<%= '-' * role.size %>
<% users.each do |user| %>
<%= user.email %>
<% end %>
<% end %>
active
------
<% @active.each do |user| %>
<%= user.email %>
<% end %>
all
---
<% @users.each do |user| %>
<%= user.email %>
<% end %>