create_task_of_capistrano_to_recreate_version_images.rb

#create capistrano task to run rake task of rails
# add below code to deploy.rb
desc "recreate version of all images."
task :recreate_version_of_images do
  on roles(:app) do
    within "#{current_path}" do
      with rails_env: :production do
        execute :rake, "images:recreate_version"
      end
    end
  end
end
# add below code in lib/tasks/image.rake
namespace :images do
  desc "Recreate versions of image"
  task recreate_version: :environment do
    puts "begin rake~~~"
    Image.all.each do |image|
      if !image.read_attribute(:image).nil?
        image.image.recreate_versions! if image.image?
      else
        image.destroy
      end
    end
  end
end