How Can I Specify A Minimum Ruby Version in a Gemfile?

问题

I know that I can specify a Ruby version in a Gemfile like so:

ruby '2.0.0'

However, instead of setting the exact Ruby version, I'd like to be able to specify a minimum Ruby version so that my scripts remain compatible with new version of Ruby.

回答1:

Already possible since Bundler 1.12, e.g.

ruby "~> 2.3.0"

see here:

https://github.com/bundler/bundler-features/issues/119

回答2:

You could raise an exception instead:

raise 'Ruby should be >2.0' unless RUBY_VERSION.to_f > 2.0

来源：https://stackoverflow.com/questions/28440712/how-can-i-specify-a-minimum-ruby-version-in-a-gemfile