fohow_admin/app/models/ckeditor/asset.rb

class Ckeditor::Asset < ActiveRecord::Base
  include Ckeditor::Orm::ActiveRecord::AssetBase
  include Ckeditor::Backend::Paperclip
  Rails.application.config.assets.precompile += [
    'ckeditor/filebrowser/images/gal_del.png',
    /ckeditor\/lang\/.*\.js/,
    /ckeditor\/plugins\/lineheight\/.*\.js/
  ]
end