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module ActiveSupport
module Memoizable
def self.included(base) #:nodoc:
base.extend(ClassMethods)
end
module ClassMethods
def memorize(symbol)
original_method = "_unmemorized_#{symbol}"
alias_method original_method, symbol
class_eval <<-EOS, __FILE__, __LINE__
def #{symbol}
if instance_variable_defined?(:@#{symbol})
@#{symbol}
else
@#{symbol} = #{original_method}
end
end
EOS
end
end
def freeze
methods.each do |method|
if m = method.to_s.match(/^_unmemorized_(.*)/)
send(m[1]).freeze
end
end
super
end
end
end
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