anchor.diff:  	</div>
   	<%= form_for "filter", url: modal_filter_submit_path do |f| %>
   	<div class="modal-body"> 
  -		<%= f.select(:metrics_select, @available_metrics.sort.map{|a| [(pretty_metric a),a]}, {prompt: nil},{ multiple: true, size: 10, class: "filter"}) %>
  +		<%= f.select(:backend, backends.map{|a| [a,a]}) %>
  +		<%= f.hidden_field(:metrics_select, style:"width: 100%") %>
  +	
   		<div class="modal-footer">
   		<%= f.submit "Filter", class: "btn btn-default" %>
   		</div>
  
positive.code: 	<% end %>
  </div></div>
  </div>
  
negative.code: <%= stylesheet_link_tag "select2" %>
  <%= javascript_include_tag "select2" %>
  <div class="modal fade" id="filter_metrics" role="dialog" aria-labelledby="filter_metrics" aria-hidden="true">
  <div class="modal-dialog"><div class="modal-content">
  	<div class="modal-header">
  