Migrate from file system to s3 (paperclip)

migrate_to_s3.rb

# replace model with your model that has an attachment
# these definitions need to be defined on the model
definitions = Model.attachment_definitions

# root directory where you're storing your files
dir = '/home/railsapps/public_html/plenishable/shared'

Model.find_each do |record|
  definitions.keys.each do |definition|
    if record.send("#{definition}_file_name")
      attachment = Paperclip::Attachment.new(definition.to_sym, record, definitions[definition.to_sym].except(:s3_credentials, :storage))
      file = dir + attachment.url
      file.gsub!(/\?.+/, '')
      if File.exists?(file)
        file_data =  File.open(file)
        puts "Saving file: #{dir + attachment.url} to Amazon S3..."
        record.send("#{definition}").assign file_data
        record.send("#{definition}").save
      else
        puts "Can't find file: #{dir + attachment.url} NOT MIGRATING..."
      end
    end
  end
end