gistfile1.rb

namespace :assets do
  desc "Normalize all Candidate attachments names"
  task :normalize => :environment do
    Candidate.find(:all, :conditions => ['candidates.id >= ? AND candidates.avatar_file_name IS NOT ?', ENV['RESUME'] || 1, nil]).each do |candidate|
      @old_paths = {}
      @bucket = ENV['BUCKET'] || 'jobandtalent_staging'
      begin
        %w{original identity contact profile}.each do |style|
          @old_paths.merge!({style => candidate.avatar.path(style)})
        end

        format = candidate.avatar.path.split('.').last
        candidate.avatar_file_name = "image.#{format}"

        @new_paths = {}
        %w{original identity contact profile}.each do |style|
          puts "Renaming #{style} image from Candidate ##{candidate.id}"
          @new_paths.merge!({style => candidate.avatar.path(style)})
          AWS::S3::S3Object.rename(@old_paths[style], @new_paths[style], @bucket, :copy_acl => true) unless @new_paths[style] == @old_paths[style]
        end
        candidate.save
      rescue AWS::S3::S3Exception => e
        puts "Failed renaming images for Candidate ##{candidate.id} with error '#{e.message}'. Reverting..."
        %{original identity contact profile}.each do |style|
          if @new_paths[style] && AWS::S3::S3Object.exists?(@new_paths[style], @bucket)
            AWS::S3::S3Object.rename(@new_paths[style], @old_paths[style], @bucket, :copy_acl => true)
          end
        end
      end
    end
  end
end