Paperclip old styles (resolutions) cleaner.

paperclip_cleaner.rb

require 'fileutils'

class PaperclipCleaner

  class << self

    def clean(parent_resource_id)
      book_images = ImageModel.where(parent_resource_id: parent_resource_id).to_a

      images.each do |image_object|

        image_dir = "#{Rails.root}/public#{image_object.page.url.split('/original').first}"

        destination_folders = Dir.entries(image_dir).select {|entry| File.directory? File.join(image_dir, entry) and !(entry =='.' || entry == '..') }

        current_styles = image_object.page.styles.keys.map(&:to_s) + ["original"]

        destination_folders.each do |folder|

          dest_path = "#{image_dir}/#{folder}"

          if File.exist?(dest_path) && current_styles.exclude?(folder)
            FileUtils.remove_dir(dest_path, true)
            print "removed: #{dest_path}\n"
          else
            puts "skipped: #{dest_path}\n"
          end
        end
      end
    end

  end

end