public Pager getProductPager(ProductCategory productCategory, Pager pager, Region region) {
   return productDao.getProductPager(
       productCategory,
       pager,
       regionService.getAllChildRegionByRegionId(region == null ? null : region.getId()));
 }
 public Pager getProductPager(ProductCategory productCategory, Pager pager) {
   return productDao.getProductPager(productCategory, pager);
 }