From: 7stud -- <bbxx789_05ss@...>
Date: 2011-04-22T07:38:53+09:00
Subject: Re: class_eval doesn't find const_missing

Andrew Berkeley wrote in post #994369:
>
> Interestingly, an explicit call to #const_missing inside a class_eval
> block DOES work.
>> DummyClass.class_eval {const_missing :ANOTHER_CONSTANT}
> => "this ANOTHER_CONSTANT was captured by #const_missing"
>
> Anybody understand this, and is there a way to get around it?
>

This line:

  DummyClass.class_eval {const_missing :ANOTHER_CONSTANT}

is equivalent to:

  DummyClass.class_eval {
    self.const_missing(:ANOTHER_CONSTANT)
  }

And because class_eval() changes self inside the block to be equal to 
the receiver, the above is equivalent to:

  DummyClass.class_eval {
    DummyClass.const_missing(:ANOTHER_CONSTANT)
  }

...producing the output you see.


Also, note the output here:

DummyClass.class_eval do
  puts self::NAME
end

--output:--
dummy constant

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