What does the -> mean next to a version number in a Gemfile?
For example:
gem 'sass-rails', '~> 3.1.5'
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1So it is, but a decent search didn't find that question.– bradCommented Jan 2, 2012 at 11:17
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2No sweat! There is plenty of space on Interwebs. A little duplication is rather good. :)– WaseemCommented Jan 2, 2012 at 19:20
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While we're mentioning duplicates, here's the oldest question that it's a dupe of: stackoverflow.com/q/3414337– ReinstateMonica3167040Commented Jan 9, 2020 at 13:36
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2 Answers
From the bundler website:
The specifier ~> has a special meaning, best shown by example:
'~> 2.0.3'is identical to'>= 2.0.3' and'< 2.1.'
'~> 2.1'is identical to'>= 2.1'and'< 3.0'.
'~> 2.2.beta'will match prerelease versions like'2.2.beta.12'.
See https://bundler.io/gemfile.html and http://guides.rubygems.org/patterns/#pessimistic-version-constraint
answered Jan 2, 2012 at 10:53
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Yes, you're right and I was way too fast with my answer and was in editing already, sorry! Commented Jan 2, 2012 at 11:00
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Okay, I had been reading the gemfile manual which didn't seem to have that info. Should have just stuck to the pretty pages!– bradCommented Jan 2, 2012 at 11:04
You usually use this to tell bundler that it's ok to install some minor updates (last digit specified can vary) but not to install some major update.
SO
~> 2.0.3 means >= 2.0.3 ∩ < 2.1
and
~> 2.1 means >= 2.1 ∩ < 3.0
Read more at https://bundler.io/gemfile.html
