Simplest way to have trinidad depend on an alternate version of jruby-rack?

Question

The current Trinidad gem depends on jruby-rack 1.1.0 which has some errors being displayed in my development log for every single one of my assets

/Users/bijan/.rvm/gems/jruby-1.7.3/gems/rack-1.4.5/lib/rack/utils.rb:399 warning: multiple values for a block parameter (2 for 1)

This is an issue that has apparently been resolved in the current jruby-rack (1.2) master branch and I'd like to make trinidad depend on this.

Is there a way to do this from within my Gemfile? Or another simpler solution than forking the Trinidad gem and specifying a different version of jruby-rack (and wishing it works since it may not).

Answer 1

TL;DR - not really. You'll need to build one or both projects or get some help from the jruby-rack team by way of a release. See bottom for build steps.

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The current Trinidad versions (1.4.4 and 1.4.5B1 prerelease) use jruby-rack with optimistic versioning (>= 1.1.10 and >= 1.1.13, respectively), so any dependency that satisfies this (say, 1.2.0) would take precedence without touching Trinidad.

Unfortunately, because of how the JAR is packaged, a git: or github: dependency will not work. You would need to build the gem yourself. This is not too bad -- you really just need Maven beyond a working JDK/JRuby setup.

Once jruby-rack is built/released with the changes, will be able to specify a workable version in your Gemfile (assuming it gets versioned 1.2.0):

gem 'jruby-rack', '~> 1.2.0'
gem 'trinidad'

Maybe the jruby-rack team could backport this specific change to the 1.1.13 maintenance line and push a 1.1.13.2 release if it doesn't introduce incompatibility. Or they may be willing to do a prerelease from master.

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I haven't tested that things work properly for assets, but building and specifying the local version was relatively easy:

# Assuming mvn is on the path, JRuby is active, and you
# have gem install permissions:
git clone https://github.com/jruby/jruby-rack.git
cd jruby-rack
bundle install
bundle exec rake clean gem SKIP_SPECS=true
gem install --local target/jruby-rack-1.2.0.SNAPSHOT.gem

After this, you can use gem 'jruby-rack', '~> 1.2.0.SNAPSHOT' in your Gemfile to satisfy Trinidad and test whether your problem is resolved.