The problem is because Rails assets compile actually added a fingerprint on to the assets file of every CKeditor file, while the rails-admin is looking for a non fingerprint version of the file.
This issue only happens in the rails 4 with ckeditor. Actually the Readme.md of the ckeditor gem did mention about the issue and how to resolve it, but it isn't complete.
To resolve you could write a rake file to remove all the fingerprints and run this during deployment.
Here is my solution to resolve this issue.
Create a rake file in lib/tasks/ckeditor.rake with the following code
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[File.join('public/assets/ckeditor', '**', '*.js'),
File.join('public/assets/ckeditor', '**', '*.js.gz'),
File.join('public/assets/ckeditor', '**', '*.css'),
File.join('public/assets/ckeditor', '**', '*.png'),
File.join('public/assets/ckeditor', '**', '*.gif')]
next unless file =~ fingerprint
nondigest = file.sub fingerprint, '.' # contents-0d8ffa186a00f5063461bc0ba0d96087.css => contents.css
FileUtils.cp file, nondigest, verbose: true
end
end
end
For Capistrano user, make sure you include this in your deploy.rb
desc 'copy ckeditor nondigest assets'
task :copy_nondigest_assets, roles: :app do
run "cd #{latest_release} && #{rake} RAILS_ENV=#{rails_env} ckeditor:create_nondigest_assets"
end
after 'deploy:assets:precompile', 'copy_nondigest_assets'
For Heroku user, you would need to run the rake file manually each time before you check in your code. Make sure you do your rake assets:precompile before this.
rake ckeditor:create_nondigest_assets
Hope it helps