Set Psych as the YAML engine for Rubinius

Since the rubysl-yaml gem doesn't ship with Psych by default because of
its dependency on libyaml, on Rubinius, the default engine is Syck.

However, if we want to be able to run the application safely on
different rubies, we need to make people using Rubinius rely on Psych.

See http://git.io/uuLVag for further information.

1 files changed, 6 insertions, 0 deletions

diff --git a/Gemfile b/Gemfile
index 60c4b31e5b..49a68c7d9d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -87,6 +87,12 @@ platforms :jruby do
   end
 end
 
+platforms :rbx do
+  # The rubysl-yaml gem doesn't ship with Psych by default
+  # as it needs libyaml that isn't always available.
+  gem 'psych', '~> 2.0'
+end
+
 # gems that are necessary for ActiveRecord tests with Oracle database
 if ENV['ORACLE_ENHANCED']
   platforms :ruby do