[Ironruby-core] Why does attr_accessor create a property, but method is just a method?

Brian Genisio briangenisio at gmail.com
Thu Jul 22 08:49:20 EDT 2010

So, I haven't heard anything about this yet on Stack Overflow, or this list.

Does anyone know if this is this a bug in IronRuby interop?


On Wed, Jul 21, 2010 at 12:34 PM, Brian Genisio <briangenisio at gmail.com>wrote:

> This is a cross-post from Stack Overflow, but I haven't heard a peep there,
> so I figured I'd try here:
> I am playing around with the interop between C# and IronRuby.  I have
> noticed that if I define a property in Ruby using `attr_accessor`, it is
> presented to C# as a property.  If, on the other hand, I create the exact
> same code manually, it comes back as a method.
> For example, take this code:
>     var engine = IronRuby.Ruby.CreateEngine();
>     string script = @"
>       class Test
>         attr_accessor :automatic
>         def manual
>           @manual
>         end
>         def manual=(val)
>           @manual = val
>         end
>         def initialize
>           @automatic = ""testing""
>           @manual = ""testing""
>         end
>       end
>       Test.new
>     ";
>     var testObject = engine.Execute(script);
>     var automatic = testObject.automatic;
>     var manual = testObject.manual;
> When you look at the C# `automatic` variable, the value is a string of
> "testing".  If you look at the C# `manual` variable, it is type
> IronRuby.Builtins.RubyMethod.
> Ultimately, I want to create my own properties in Ruby that can be used in
> C#, but I can't seem to make them be visible as properties like
> `attr_accessor` does.
> I THINK, that there is some magic going on in the Module code of the Ruby
> source code (ModuleOps.cs:DefineAccessor).  Is there any way to do this in
> Ruby code directly?
> Thanks,
> Brian
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