Question

module CallableDict
  def method_missing method
    puts x["#{method}"]
  end
end

The above code is my module, it makes hash keys callable. When I run it though…

require 'callabledict'
x = {"foo" => "ruby"}
x.extend CallableDict
x.foo

I get the following…

SystemStackError: stack level too deep
    from /Users/Solomon/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/irb/workspace.rb:80
Maybe IRB bug!

Why? Hpw can I fix this?

Answer 1

actually x is a self so you can rewrite it like this:

module CallableDict
  def method_missing method
    puts self["#{method}"]
  end
end