app/views/admin/simple_crud/_simple_search.html.erb
<%= form_tag collection_url,
:method => :get, :html => {:class => 'form-inline'} do %>
<% if params[:type].present? %>
<%= hidden_field_tag :type, params[:type] %>
<% end %>
<div class="input-prepend">
<span class="add-on"><i class="icon-search"></i></span>
<%= text_field_tag :query, params[:query], :class => "input-xxlarge" %>
</div>
<% if @years %>
<%= select_tag :year, options_for_select(@years, params[:year]) %>
<% end %>
<%= submit_tag 'Search', :class => "btn search-btn"%>
<% end %>