使用回形针将数千张图片上传到S3

namespace :images do
  desc \"Upload images.\"
  task :create => :environment do
    @images = Dir[\"#{RAILS_ROOT}/public/images/*.*\"]
    for image in @images
      MyModel.create(:image => File.open(image))
    end
  end
end

# lib/image_management.rake
namespace :images do
  desc \'upload images through paperclip with postprocessing\'
  task :create => :environment do

    directory = \"/Volumes/data/historicus/_projects/deeplandscapes/library/tifs/*.tif\"
    images = Dir[directory]

    puts \"\\n\\nProcessing #{ images.length } images in #{directory}...\"

    items_with_errors = []
    items_updated = []
    items_skipped = []

    images.each do |image|
    # find the needed record
      image_basename = File.basename(image)
      id = image_basename.gsub(\"it_\", \"\").gsub(\".tif\", \"\").to_i
      if id > 0
        item = Item.find(id) rescue nil
        # check if it has an image already
        if item
          unless item.image.exists?
            # create the image
            success = item.update_attributes(:image => File.open(image))
            if success
              items_updated << item
              print \' u \'
            else
              items_with_errors << item
              print \' e \'
            end
          else
            items_skipped << item
            print \' s \'
          end
        else
          print \"[#{id}] \"
        end
      else
        print \" [no id for #{image_basename}] \"    
      end
    end
    unless items_with_errors.empty?
      puts \"\\n\\nThe following items had errors: \"
      items_with_errors.each do |error_image|
        puts \"#{error_image.id}: #{error_image.errors.full_messages}\"
      end
    end

    puts \"\\n\\nUpdated #{items_updated.length} items.\"
    puts \"Skipped #{items_skipped.length} items.\"
    puts \"Update complete.\\n\"

  end
end