Forum: IronRuby Fwd: "can't convert Subclass_..." when isolating an interface

try doing

ITestService.isolate

or

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

It looks like the generated isolation isn't implementing 
IHomeRepository:

irb(main):032:0> repo = isolate 
FakeMvcProject::Controllers::IHomeRepository
=> #<Object805c8b559a854b9ca0269e9b1d7f7643:0x0000482>
irb(main):033:0> repo.GetType.get_interfaces
=> [System.ComponentModel.ICustomTypeDescriptor,
IronRuby.Runtime.Calls.IRubyDynamicMetaObjectProvider,
System.Dynamic.IDynamicMetaObjectProvider,
IronRuby.Runtime.IRubyObject,
IronRuby.Runtime.IRubyObjectState,
IronRuby.Runtime.IDuplicable,
System.Runtime.Serialization.ISerializable]


I also tried this (notice that IHomeRepository *is* listed):

irb(main):034:0> class Foo
irb(main):035:1>   include IHomeRepository
irb(main):036:1> end
=> Foo
irb(main):037:0> Foo.new.GetType.get_interfaces
=> [IronRuby.Runtime.IRubyObject,
IronRuby.Runtime.IRubyObjectState,
System.Runtime.Serialization.ISerializable,
IronRuby.Runtime.Calls.IRubyDynamicMetaObjectProvider,
System.Dynamic.IDynamicMetaObjectProvider,
System.ComponentModel.ICustomTypeDescriptor,
IronRuby.Compiler.Generation.IRubyType,
FakeMvcProject.Controllers.IHomeRepository]


It looks like this might be a problem with Caricature (perhaps only when
running IR 1.1?).


-Charles

Aha! I've figured it out.

Here's the `isolate' method (from lib/caricature/core_ext/object.rb):

 def isolate(name=nil, recorder = Caricature::MethodCallRecorder.new,
expectations = Caricature::Expectations.new, &block)
    iso = Caricature::Isolation.for(self, recorder, expectations)
    return iso unless name
    if block
      if block.arity > 0
        @expectation = iso.when_receiving(name, &block)
      else
        @expectation = iso.when_receiving(name)
        instance_eval &block
      end
    end
    iso
  end


The important line to note is the following:
    iso = Caricature::Isolation.for(self, recorder, expectations)

This `isolate' method let's you do stuff like `IHomeRepository.isolate'.

The TypeError you are experiencing is due to the fact that you are 
isolating
whatever the implicit `self' happens to be at the time you call 
`isolate'.
If you instead use `IHomeRepository.isolate', or 
`Caricature::Isolation.for
IHomeRepository', it should work just fine.

Perhaps Caricature could be tweaked a little so that making this mistake 
is
more obvious (I was stumped too ;P).

Cheers,
-Charles


On Wed, Aug 4, 2010 at 9:47 PM, Charles Strahan 
<charles.c.strahan@gmail.com