保存后的回形针重命名文件 [英] Paperclip renaming files after they're saved

问题描述

如何在上传和保存文件后重命名文件?我的问题是，我需要自动解析有关文件的信息，以便得出文件应与我的应用程序一样保存的文件名，但我无法访问生成文件名所需的信息，直到记录模型已保存.

How do I rename a file after is has been uploaded and saved? My problem is that I need to parse information about the files automatically in order to come up with the file name the file should be saved as with my application, but I can't access the information required to generate the file name till the record for the model has been saved.

推荐答案

例如，如果您的模型具有属性图像:

If, for example, your model has attribute image:

has_attached_file :image, :styles => { ...... }

默认情况下，papepclip 文件存储在/system/:attachment/:id/:style/:filename 中.

By default papepclip files are stored in /system/:attachment/:id/:style/:filename.

因此，您可以通过重命名每个样式然后更改数据库中的 image_file_name 列来完成它.

So, You can accomplish it by renaming every style and then changing image_file_name column in database.

(record.image.styles.keys+[:original]).each do |style|
    path = record.image.path(style)
    FileUtils.move(path, File.join(File.dirname(path), new_file_name))
end

record.image_file_name = new_file_name
record.save

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