From: Gavin Sinclair <gsinclair@...>
Date: 2004-08-24T13:58:22+09:00
Subject: Re: OpenStruct respond_to? problem

On Tuesday, August 24, 2004, 1:03:40 PM, Austin wrote:

> On Tue, 24 Aug 2004 09:59:15 +0900, Jamis Buck <jgb3@email.byu.edu> wrote:
>> I blindly assumed that OpenStruct would handle respond_to? properly, but
>> I'm seeing the following behavior:
>> 
>>    o = OpenStruct.new( :type_id => "string" )
>>    p o.type_id #-> "string"
>>    p o.respond_to?( :type_id ) #-> false
>> 
>> Is this the correct behavior for OpenStruct, or should this be reported
>> as a bug?

> I think that OpenStruct uses #method_missing.

Indeed it does.  If respond_to? is to work, you'd need to implement
it.  Utterly untested:

  class OpenStruct
    def respond_to?(sym)
      super or @table.key?(sym.to_sym)
    end
  end

There's probably several problems with OpenStruct along these lines.
I don't think #hash is implemented, for example.

Gavin