image.rb

  def upload(file)
    require 'fileutils'
    # Get upload path and create it if needed
    file_dir = self.user.get_file_dir
    FileUtils.mkdir_p(file_dir)

    filename = file.original_filename
    tmpfile = file.tempfile

    # Write the file with a unique filename
    loop do
      begin
        file_path = path(filename)
        File.open(file_path, File::CREAT | File::EXCL | File::WRONLY) do |file|
          file.write(tmpfile.read)
        end
        break
      rescue Errno::EEXIST
	puts "File exists #{filename}"
        filename = increment(filename)
        redo
      end
    end

    self.filename = filename
    self.save
  end