app/views/advanced/_advanced_search_fields.html.erb
<%- search_fields_for_advanced_search.each do |key, field_def| -%>
<div class="form-group advanced-search-field">
<%= label_tag key, label_for_search_field(key), class: "col-sm-3 control-label" %>
<div class="col-sm-9">
<%= text_field_tag key, label_tag_default_for(key), class: "form-control" %>
</div>
</div>
<%- end -%>