回形针，如何在文件末尾附加一个随机图章? [英] Paperclip, how to append a random stamp at the end of the file?

问题描述

我在 Rails 3 应用中使用回形针.我想在文件末尾附加一个随机字符串，不要太长或太疯狂来缓存 CDN.有谁知道一个真正简单的方法来做到这一点?

I'm using paperclip with my rails 3 app. I want to append a random string, nothing to long or crazy at the end of the file to cache bust the CDN. Anyone know a real simple way to do this?

这是我目前拥有的:

  has_attached_file :photo,
    :styles => { :thumb => "70x70>" },
    :storage => :s3,
    :s3_credentials => "#{Rails.root}/config/s3.yml",
    :path => "/:rails_env/public/users/:id/:style/:basename.:extension",
    .....

我想要一个像 FILENAME_31313.png 这样的文件名

I would like a file name like FILENAME_31313.png

每次保存照片时 31313 都是随机的.

Where 31313 is random every time a photo is saved.

谢谢

推荐答案

你可以使用这样的东西来完成工作:

You can use something like this to get the job done:

before_create :generate_random_hex

private
def generate_random_hex
  self.random_hex = ActiveSupport::SecureRandom.hex(8)
end

Paperclip.interpolates :random_hex do |attachment, style|
  attachment.instance.random_hex
end

然后像这样修改你的回形针设置:

Then modify your paperclip settings like so:

has_attached_file :photo,
  :styles => { :thumb => "70x70>" },
  :storage => :s3,
  :s3_credentials => "#{Rails.root}/config/s3.yml",
  :path => "/:rails_env/public/users/:id/:style/:basename_:random_hex.:extension",

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