From: Minkoo Seo <minkoo.seo@...>
Date: 2006-07-09T16:17:59+09:00
Subject: attr_reader as a class method

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Hi list.

I'd like to use attr_reader to introduce a class method. For example,
the following is the code I've tried.

irb(main):001:0> class Foo
irb(main):002:1>   ONE = 1
irb(main):003:1> end
=> 1
irb(main):004:0> class Foo
irb(main):005:1>   attr_reader :ONE
irb(main):006:1> end
=> nil
irb(main):007:0> Foo.ONE
NoMethodError: undefined method `ONE' for Foo:Class
        from (irb):7
        from :0
irb(main):008:0> class Foo
irb(main):009:1>   class << self
irb(main):010:2>     attr_reader :ONE
irb(main):011:2>   end
irb(main):012:1> end
=> nil
irb(main):013:0> Foo.ONE
=> nil
irb(main):014:0>

As you can see, I've failed. But the following works:

irb(main):014:0> class Foo
irb(main):015:1>   def self.ONE
irb(main):016:2>     return ONE
irb(main):017:2>   end
irb(main):018:1> end
=> nil
irb(main):019:0> Foo.ONE
=> 1
irb(main):020:0>

How can I use attr_reader to introduce a method I've written
right above?

Sincerely,
Minkoo Seo

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