@items = @sub_category.items.where("size >= ?", params[:diameter].first) if params[:diameter].present?
@items = @sub_category.items.where("size <= ?", params[:diameter].last) if params[:diameter].present?
= text_field_tag "prop[one]", nil, data: { slider-min: min, slider-max: max, slider-step: step, slider-value: value }, class: 'span2'
<input readonly="" class="span2" data-slider-max="5000" data-slider-min="800" data-slider-step="10" data-slider-value="250,450" id="" name="prop[one]" type="text">