Question

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?

Here is what I have currently:

  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",
    .....

I would like a file name like FILENAME_31313.png

Where 31313 is random every time a photo is saved.

Thank you

Answer 1

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

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",