[Ironruby-core] Building expressions

Curt Hagenlocher curth at microsoft.com
Tue May 5 10:53:06 EDT 2009

Of course you should be able to build the expression tree manually – though even here, you may have trouble under .NET 3.5 as a result of the duplicated namespace. (That issue goes away with .NET 4.)

From: ironruby-core-bounces at rubyforge.org [mailto:ironruby-core-bounces at rubyforge.org] On Behalf Of Ivan Porto Carrero
Sent: Tuesday, May 05, 2009 7:46 AM
To: ironruby-core at rubyforge.org
Subject: Re: [Ironruby-core] Building expressions

I have since changed my approach. I've also talked with Mark about approaching this.

The approach I take now is to generate a proxy to the object/class/interface that will record method calls.
After recording you can then run verifications on those method calls.  The way I generate the proxy for an interface came out of my talk with Mark.


But the deeper implication is then that when a library uses Expression<Func<,>> as parameters you cannot use it from ironruby at all?  Not even by building the expression tree yourself?

(I forgot to hit send apparently :))
Met vriendelijke groeten - Best regards - Salutations
Ivan Porto Carrero
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Author of IronRuby in Action (http://manning.com/carrero)

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On Sun, May 3, 2009 at 11:37 PM, Shri Borde <Shri.Borde at microsoft.com<mailto:Shri.Borde at microsoft.com>> wrote:

It cannot be done. Even if you could get to the ExpressionTree of a Ruby lambda, the ExpressionTree would be loosely-bound as Ruby uses duck-typing, whereas Moq expects a strongly-typed ExpressionTree so that it can figure out the exact method that you are trying to associate some expectation with.

FWIW, Mark had also been playing with mocking, and in our discussions, we said that the easiest mocking approach would be to use Ruby features like method_missing, monkey-patching, etc (like rspec does). Ie. something like this:

def mock(clrInterface):

  class ClrMock < clrInterface

    # monkey-patch all of “clrInterface.methods" here, and redirect to the mocking framework


  return ClrMock.new


From: ironruby-core-bounces at rubyforge.org<mailto:ironruby-core-bounces at rubyforge.org> [mailto:ironruby-core-bounces at rubyforge.org<mailto:ironruby-core-bounces at rubyforge.org>] On Behalf Of Ivan Porto Carrero
Sent: Sunday, May 03, 2009 3:18 AM
To: ironruby-core
Subject: [Ironruby-core] Building expressions


I'm trying to get some Moq mockery going in IronRuby but Moq expects Expression<Func<MyObject, TReturn>> in his methods.
Is there a way to make a RubyProc/lambda return an expression or convert it to an expression?

Met vriendelijke groeten - Best regards - Salutations
Ivan Porto Carrero
Author of IronRuby in Action (http://manning.com/carrero)

Steve Martin<http://www.brainyquote.com/quotes/authors/s/steve_martin.html>  - "I've got to keep breathing. It'll be my worst business mistake if I don't."

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