Managing Multiple Rails Versions in Development

You can have multiple Rails versions installed at the same time.

To install the rails version you need:

gem install rails --version=5.2.8

How to specify the rails version to use

rails _5.2.8_ new old_school_rails

And inside the project, you will have the correct rails version

cd old_school_rails
bundle exec rails --version
Rails 5.2.8.1