app/views/users/_fetch_user_info.html.erb
<div class="chip">
<img src="<%= user.profile_url %>" alt="Contact Person">
<%= "#{user.first_name} (#{user_role})" %> 
<a href="#" data-remote="true"><span class="remove_staff">x</span></a>
<input type="hidden" id ="uid"name = "event[event_staffs_attributes][][user_id]" value = "<%= user.id %>" />
<input type="hidden" name = "event[event_staffs_attributes][][role]" value = "<%= role %>" />
</div>