From: 7stud -- <bbxx789_05ss@...>
Date: 2011-04-12T11:48:38+09:00
Subject: Re: Copying parameters to singleton class

...but then you could do this:

module ClassFactory
  def ClassFactory.included(includer)
    includer.extend(ClassMethods)
  end

  module ClassMethods

    def using(hash)
      Class.new do
        @options = hash
        class << self
          attr_reader :options
        end
      end
    end

  end
end

class Opportunities
  include ClassFactory
end

Foo = Opportunities.using({one: 1, two: 2, three: 3})
Bar = Opportunities.using({four: 4, five: 5, six: 6})

p Foo.options
p Bar.options

--output:--
{:one=>1, :two=>2, :three=>3}
{:four=>4, :five=>5, :six=>6}


I really wanted to write that like below, but it doesn't work??

module ClassFactory
  def ClassFactory.included(includer)
    includer.extend(ClassMethods)
  end

  module ClassMethods

    def using(hash)
      Class.new do
        @options = hash
      end
    end

    def options
      @options
    end

  end
end

class Opportunities
  include ClassFactory
end

Foo = Opportunities.using({one: 1, two: 2, three: 3})
Bar = Opportunities.using({four: 4, five: 5, six: 6})

p Foo.options
p Bar.options

--output:--
prog.rb:28:in `<main>': undefined method `options' for Foo:Class 
(NoMethodError)

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