useremail.html.erb

<div class="col-lg-3">&nbsp;</div>
<div class="col-lg-9">

  <h3>User lookup by email:</h3> 

  <p>Moderators and admins have the ability to search for usernames associated with a given email address. This ability is meant to assist in answering requests submitted by email where the user forgets to specify their username; clearly the email address of the sender is known.</p>
  <%= form_tag do %>
    <%= text_field_tag(:address, value = @address) %>
    <%= button_tag(:search, type: 'submit', class: "btn btn-primary") do %>
      <i class="fa fa-search fa fa-white"></i>
    <% end %>
</button>
  <% end %>

<% if @address %>
  <h3>Searched for <%= @address %></h3> 
  <% if @users.length > 0 %>
  <ul>
    <% @users.each do |user| %>
    <li><a href="/profile/<%= user.username %>"><%= user.username %></a></li>
    <% end %>
  </ul>
  <% else %>
  <p>No users found with that email address!</p>
  <% end %>
<% end %>
</div>