delayed_job_model.rb

# delayed job method on model
def process_images(urls)
  require 'open-uri'
  item = self
  image_urls   = urls.split(", ")

  image_urls.each do |url|
    file = URI.parse(url).open
    item.images.build(:cat => cat, :avatar => file)
  end	
  item.save
end
	
# Image model setup for resize
has_attached_file :avatar, :styles => {
   :preview => ["150x150>",:jpg],
   :thumb => ["150x172#",:jpg],
   :large => ["100%", :jpg]
  },
:storage => :s3,
:bucket => ENV['AWS_BUCKET'],
:s3_credentials => {
  :access_key_id => ENV['AWS_ACCESS_KEY_ID'],
  :secret_access_key => ENV['AWS_SECRET_ACCESS_KEY']
}