问题
I'm looking to upgrade a large application with many gems. It's currently on Ruby 1.9.3p551.
I've heard that I can upgrade to Ruby 2.2 but not any higher.
Is this version of Rails compatible with Ruby 2.2.5, alternatively, how can I find out the highest possible version supported.
回答1:
Quote from this blog post
Rails 3.2.22 includes all the commits from the 3-2-stable branch. This mean that now Rails 3.2 supports Ruby 2.2.
Since Rails 3.2 doesn't receive bug fixes anymore (only severe security fixes) I would not expect updates to the Rails 3.2 branch that ensure Ruby 2.3 compatibility. Furthermore Rails 3.2 reaches end of life when Rails 5.0 is released (what will be very soon, since 5.0.0.RC1 is already available).
来源：https://stackoverflow.com/questions/37271441/when-using-rails-3-2-22-2-what-is-the-highest-ruby-version-i-can-use