From: Ralph Shnelvar <ralphs@...32.com>
Date: 2010-02-04T20:21:57+09:00
Subject: Re: hooking subscript operations in a hash

Wednesday, February 3, 2010, 8:53:49 PM, you wrote:

WH> On 2/3/2010 8:11 PM, Ralph Shnelvar wrote:
>> Is there any way to do it for all hash subscript operations?

irb(main):012:0>> class Hash
irb(main):013:1>> alias_method :old, :[]=
irb(main):014:1>> def []=(index, value)
irb(main):015:2>> p index
irb(main):016:2>> p value
irb(main):017:2>> old index, value
irb(main):018:2>> end
irb(main):019:1>> end
=>> nil
irb(main):020:0>> x={}
=>> {}
irb(main):021:0>> x[:foo]=:bar
WH> :foo
WH> :bar
=>> :bar


WH> That should get you where your trying to go.

WH> Best of luck!

So I tested this in irb and it seems to work fine ...

Then I stuck this into init.rb as part of a Rails app and ... boom ...


f:\Ralph-Rails-Apps\WebOfTrust>ruby script/server webrick --debugger
=> Booting WEBrick
=> Rails 2.3.5 application starting on http://0.0.0.0:3000
F:/InstantRails-2.0-win/ruby/lib/ruby/gems/1.8/gems/validates_captcha-0.9.6/rail
s/init.rb:11:in `alias_method': undefined method `[]=' for class `Rails::Plugin:
:Hash' (NameError)
        from F:/InstantRails-2.0-win/ruby/lib/ruby/gems/1.8/gems/validates_captc
ha-0.9.6/rails/init.rb:11:in `evaluate_init_rb'
        from F:/InstantRails-2.0-win/ruby/lib/ruby/gems/1.8/gems/rails-2.3.5/lib
/rails/plugin.rb:158:in `evaluate_init_rb'
        from F:/InstantRails-2.0-win/ruby/lib/ruby/gems/1.8/gems/activesupport-2
.3.5/lib/active_support/core_ext/kernel/reporting.rb:11:in `silence_warnings'
        from F:/InstantRails-2.0-win/ruby/lib/ruby/gems/1.8/gems/rails-2.3.5/lib
/rails/plugin.rb:154:in `evaluate_init_rb'
        from F:/InstantRails-2.0-win/ruby/lib/ruby/gems/1.8/gems/rails-2.3.5/lib
/rails/plugin.rb:48:in `load'
        from F:/InstantRails-2.0-win/ruby/lib/ruby/gems/1.8/gems/rails-2.3.5/lib
/rails/plugin/loader.rb:38:in `load_plugins'
        from F:/InstantRails-2.0-win/ruby/lib/ruby/gems/1.8/gems/rails-2.3.5/lib
/rails/plugin/loader.rb:37:in `each'
        from F:/InstantRails-2.0-win/ruby/lib/ruby/gems/1.8/gems/rails-2.3.5/lib
/rails/plugin/loader.rb:37:in `load_plugins'
         ... 10 levels...
        from F:/InstantRails-2.0-win/ruby/lib/ruby/gems/1.8/gems/rails-2.3.5/lib
/commands/server.rb:84
        from F:/InstantRails-2.0-win/ruby/lib/ruby/site_ruby/1.8/rubygems/custom
_require.rb:31:in `gem_original_require'
        from F:/InstantRails-2.0-win/ruby/lib/ruby/site_ruby/1.8/rubygems/custom
_require.rb:31:in `require'
        from script/server:3


I am so lost.

Rails has a plugin for Hash?!?!?!?  And []= is undefined?!?!?