ckeditor_fix.rb

# 1) Add to your root .js file (like application.js):

//= require ckeditor/override
//= require ckeditor/init

#2) Create new .rake task in this code to your "lib" folder:

namespace :ckeditor do
  desc 'Create nondigest versions of some ckeditor assets (e.g. moono skin png)'
  task :create_nondigest_assets do
    fingerprint = /\-[0-9a-f]{32}\./
    for file in Dir['public/assets/ckeditor/contents-*.css', 'public/assets/ckeditor/skins/moono/*.png']
      next unless file =~ fingerprint
      nondigest = file.sub fingerprint, '.' # contents-0d8ffa186a00f5063461bc0ba0d96087.css => contents.css
      FileUtils.cp file, nondigest, verbose: true
    end
  end
end

# auto run ckeditor:create_nondigest_assets after assets:precompile
Rake::Task['assets:precompile'].enhance do
  Rake::Task['ckeditor:create_nondigest_assets'].invoke
end

# to copy non-digest copies of CKeditor files after assets:precompile on deploying