CODEWITHSUNDEEP
rubyrubygems
viraptor
viraptor

Reputation: 34145

How to obtain gems compatibility version from Ruby

Ruby gems are installed into directories called after the last compatible version rather than specific release. How can I obtain that version?

For example for Ruby 2.3.3, gems will be installed into 2.3.0 directory. How do I find out what that version is from a ruby interpreter?

Upvotes: 1

Views: 152

Answers (3)

viraptor
viraptor

Reputation: 34145

Other answers that are kind of correct, but use paths. I tracked it down to:

Gem.ruby_api_version

Which will return the version on its own.

Upvotes: 2

burnettk
burnettk

Reputation: 14047

i get that same behavior with 2.3.1. here's one way of coming up with "2.3.0":

% ruby -v
ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-darwin16]

% ruby -e 'print Gem.user_dir'
/Users/kburnett/.gem/ruby/2.3.0

% ruby -e "print RbConfig::CONFIG['ruby_version']"
2.3.0

Upvotes: 0

sawa
sawa

Reputation: 168071

Gem.loaded_specs

will give you a hash of loaded gems. From that list, choose one gem:

Gem.loaded_specs["did_you_mean"]
# => {"did_you_mean"=>#<Gem::Specification:0x2abac1f4ecb8 did_you_mean-1.0.0>}

gem_dir will give you the directory:

Gem.loaded_specs["did_you_mean"].gem_dir
# => ".../.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/did_you_mean-1.0.0"

In this case, I am using Ruby 2.3.3, and the gems are under the 2.3.0 directory.

Upvotes: 0

Related Questions