Only mentions Rails 3 in the GitHub documentation - does anyone know if it's compatible with Rails 4?
I ask because it looks like it's been updated to handle Ruby 2.1.0
According to the travis build, tests pass with active record 4.
Indeed, it works. We've been using it in one of our recent projects. You can also look at travis.yml file in the repo. It was tested to work with ActiveRecord 4.0.
Yes it's compatible with Rails 4, but you need to add :parent_id to permit params in your controller.
来源：https://stackoverflow.com/questions/21333218/does-the-ancestry-gem-work-with-rails-4