anchor.diff:        </div>
   
       <header class="panel-heading border-header">
  -      Category
  +      Cidade
       </header>
   
       <div class="panel-body">
  -    <select multiple name="cities[]" class="col-xs-12 col-md-13 col-lg-13" placeholder="sel. cidades">
  +    <select multiple name="cities[]" class="col-xs-12 col-md-13 col-lg-13" placeholder="Procure por cidades...">
       <option value="">Selecione...</option>
       <% @districts.each do |district| %>
         <% !params[:cities].blank? ? (cities = params[:cities]) : (cities = [])%>
  
positive.code: <%= form_tag ads_path ,:method => :get do%>
    <section class="panel">
        <header class="panel-heading">
            Category
        </header>
        <div class="panel-body">
            <ul class="nav prod-cat">
                 <% @categories.each do |cat| %>
                    <li>
                      <i class=" fa fa-angle-right"></i>
                      <% if !params[:search].nil? %>
                          <% if params[:search].include?("cat:" + "#{cat.id}") %>
                              <%= check_box_tag "search[]","cat:#{cat.id}", "active" %>
  
negative.code:     <% end %>
      </select>
      </div>
  
       
    <%= submit_tag "Filtrar",class:"btn btn-default btn-sm",style:"width:100%" %>
  <% end %>