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If there are two gems, A and B. A1.0.0 depends on B1.0.0.
In my Gemfile:
gem 'A', '~> 1.0.0'
Then run bundle. It will generate a Gemfile.lock like:
A (1.0.0)
B (1.0.0)
But if I want to force A to use B1.0.1, what's the best practice? Moreover, if the B1.0.1 is not release but a github tag?
592
run the command bundle install in your shell, once you have your Gemfile created. This command will look your Gemfile and install the relevant Gems on the indicated versions. The Gemfiles are installed because in your Gemfile you are pointing out the source where the gems can be downloaded from.
Common Attempts To Resolve Ruby Gem Dependencies Bundler can help to resolve dependencies when working with Ruby gems by allowing you to specify a set of gems in a Gemfile, then issue a single command to install them. Bundler then automatically resolves the dependencies for you.
You'll need to explicitly specify the B gem in your Gemfile to use a git repository or another version. As long as A 1.0.0 is compatible with B 1.0.1 you'll be fine. If it is only compatible with B 1.0.0 then you'll have to create your own fork of the A gem and upgrade the gemspec to be compatible with B 1.0.1 and then use that repository as your gem for A instead of the rubygems version.
Here is a sample Gemfile that should give you what you want, provided A 1.0.0 is compatible with B 1.0.1.
gem 'B', :git => 'git://github.com/B/B.git', :tag => '1.0.1'
gem 'A', '~> 1.0.0'
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