回形针-保存前重命名文件 [英] Paperclip - rename file before saving

问题描述

我使用这种方法在保存之前重命名图像:

I use this method for renaming the image before the saving:

  def rename_avatar
    self.avatar.instance_write :file_name, Time.now.to_i.to_s
  end

  before_post_process :rename_avatar

该图像已按当前时间重命名，但未添加文件类型，而不是仅保存 1334487964.. 1334487964.jpg .

The image is renamed by the current time, but there's not added the file type, instead of 1334487964.jpg is saved only 1334487964..

我在那儿想念什么?我以为:文件名仅包含文件名-没有文件类型

What I missing there? I thought :file_name contains only the file name - without the file type

推荐答案

这是解决问题的方法:

  def rename_avatar
    #avatar_file_name - important is the first word - avatar - depends on your column in DB table
    extension = File.extname(avatar_file_name).downcase
    self.avatar.instance_write :file_name, "#{Time.now.to_i.to_s}#{extension}"
  end

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