Paperclip processor not changing file contents

Question

I am trying to convert the lines of an uploaded text file attachment using a Paperclip processor in rails. I can verify with a debugger that my processor is called, but the file that gets attached is my original file, not the file written by the processor. Here is my processor:

module Paperclip
  class Utf8 < Processor
    def initialize(file, options={}, attachment=nil)
      super
      @file           = file
      @attachment     = attachment
      @current_format = File.extname(@file.path)
      @format         = options[:format]
      @basename       = File.basename(@file.path, @current_format)
    end

    def make
      @file.rewind
      tmp = Tempfile.new([@basename, @format])

      IO.foreach(@file.path) do |line|
        tmp << line.encode('UTF-8', 'binary', invalid: :replace, undef: :replace, replace: '')
      end

      tmp.flush
      tmp
    end
  end
end

and here is my model:

class List < ActiveRecord::Base
  has_attached_file :file,
                    storage: :s3,
                    s3_credentials: Rails.root.join('config', 'aws.yml'),
                    bucket: Rails.application.config.s3_bucket,
                    processors: [:utf8],
                    styles: {
                        utf8: {
                            format: 'txt'
                        }
                    }
end

Any idea what I'm doing wrong? As I understand it, the file returned from make is what paperclip attaches to the model. Might s3 have anything to do with this?

Answer 1

Found a solution: paperclip saves each style is as a separate file. To overwrite the original file instead of creating a new one, I had to change my model to:

class List < ActiveRecord::Base
  has_attached_file :file,
                    storage: :s3,
                    s3_credentials: Rails.root.join('config', 'aws.yml'),
                    bucket: Rails.application.config.s3_bucket,
                    processors: [:utf8],
                    styles: {
                        original: { # specifying original style here causes the original file to be overwritten
                            format: 'txt'
                        }
                    }
end