#在庫管理履歴プレビュー
def stock_histories
product_style_id = params[:id].to_i
- if !product_style_id.blank? && product_style_id=~ /^\d*$/
+ if !product_style_id.blank? && product_style_id.to_s =~ /^\d*$/
@product_style = ProductStyle.find_by_id(product_style_id.to_i)
if !@product_style.blank?
@stock_histories = @product_style.stock_histories