[1.9] Array#join using to_a instead of to_s when both defined
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Key: JRUBY-5394
URL: http://jira.codehaus.org/browse/JRUBY-5394
Project: JRuby
Issue Type: Bug
Components: Core Classes/Modules
Affects Versions: JRuby 1.6RC1, JRuby 1.6RC2
Environment: jruby 1.6.0.RC1 (ruby 1.9.2 trunk 136) (2011-01-10
769f847) (Java HotSpot(TM) 64-Bit Server VM 1.6.0_22) [darwin-x86_64-java]
Reporter: Micah Alles
Attachments: join_using_to_a_test.rb
When both the #to_a and #to_s methods are defined on an object in an array
which #join is called on, #to_a is used instead of #to_s for determining the
string value of the object which is joined. The return value of the #to_a call
also seems to be flattened with the containing array before the join is applied.
This is causing a problem with url slug generation of Mongoid documents in
rails 3.
A test/unit testcase for this issue is attached. This issue only occurs when
enabling 1.9 support with --1.9. This test passes on MRI 1.9.2 and JRuby 1.6RC1
--1.8.
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