Array#reject Does Not Retain Instance Variables
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Key: JRUBY-5245
URL: http://jira.codehaus.org/browse/JRUBY-5245
Project: JRuby
Issue Type: Bug
Components: Core Classes/Modules
Affects Versions: JRuby 1.5.6
Environment: Mac OS X 10.6.5, JRuby 1.5.6 as installed by RVM
Reporter: Paul Mucur
Priority: Minor
Attachments: array_reject_test.rb
Setting an instance variable on an array and then using Array#reject will cause
the returned array to lose its state:
In C Ruby:
$ irb
ruby-1.8.7-p302 > a = []
=> []
ruby-1.8.7-p302 > a.instance_variable_set("@name", "Bob")
=> "Bob"
ruby-1.8.7-p302 > a.reject {}.instance_variable_get("@name")
=> "Bob"
In JRuby:
L3922:~ (jruby-1.5.6)
$ irb
a = [jruby-1.5.6 > a = []
=> []
jruby-1.5.6 > a.instance_variable_set("@name", "Bob")
=> "Bob"
jruby-1.5.6 > a.reject {}.instance_variable_get("@name")
=> nil
Note that the same doesn't apply for Enumerable#find_all which returns a new
array populated with matching elements rather than copying the original array
and deleting matching elements.
Simply #duping the array seems to work fine however:
jruby-1.5.6 > a.dup.instance_variable_get("@name")
=> "Bob"
This came up due to will_paginate's storing of a @total_pages variable on an
array which would be set to nil upon using #reject.
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