我需要获取 Paperclip 上传的文件的文件系统 url。我试着这样做
ProjectAttachment.last.attachment.url
ProjectAttachment Load (0.6ms)
SELECT `project_attachments`.* FROM `project_attachments`
ORDER BY `project_attachments`.`id` DESC LIMIT 1 => "/system/project_attachments/attachments/000/000/014/original/Updated_test_v1_2a.xlsx?1367191020"
为什么要?1367191020
在文件后添加?有没有办法确保它不会被添加到 URL 中?