From: Eero Saynatkari <eero.saynatkari@...>
Date: 2006-09-03T05:08:49+09:00
Subject: Re: yielding a block to another block

David Chelimsky wrote:
> Hi all,
> 
> The mocking framework in rspec uses method_missing to capture all the
> messages sent to it, comparing the message to a list of expected
> messages. For various reasons I'm trying to rework this so that
> instead of using method_missing, we define the expected message on the
> mock on the fly.
> 
> For that to happen, setting expectations on the mock ends up invoking 
> this:
> 
>       def define_expected_method(sym)
>         (class << self; self; end).__send__(:define_method, sym,
> lambda {|*args| message_received(sym, *args)})
>       end
> 
> The Proc yields *args, which are then passed to message_received. How
> can I get the Proc to yield a block that is passed in with the call to
> :sym? I tried this:
> 
> lambda {|*args, &block| ....
> 
> but it throws an error. Any other ideas? Let me know if the question
> is not clear.

You cannot currently do that with a block (1.9 and 2.0 will
allow &block arguments). In the meanwhile, you can #eval the
method into existence instead:

  def define_expected_method(sym)
    class << self; self; end.__send__ :class_eval, %{
      def #{sym}(*args, &block)
        message_received sym, *args, &block    # ?
      end
    }
  end

> Thanks,
> David


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