From: "Wayne E. Seguin" <wayneeseguin@...>
Date: 2007-10-05T23:45:46+09:00
Subject: Re: Refering to an object's 'parent'

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On 10/5/07, Toby Rodwell <trodwell@iee.org> wrote:
>
> I'd like to check an object's "parent" to see if it has a certain
> method, so for example, given ...
>
> class House(type)
>   attr_accessor :rooms, :type_of_house
>   @rooms = []
>   ...
>   def type_of_house
>     type
>   end
> end
>
> class Room
> ...
> end
>
> my_room = Room.new
>
> my_house = House.new
>
> my_house.rooms.push(my_room)
>
> ... then is it somehow possible to ask ...
> my_room.<PARENT>.respond_to?(type_of_house) ?
> (I know 'House' is not really the parent of 'Room', and so I suspect the
> answer is "no", but it can't hurt to ask.  Thanks
>

I don't believe so the way you have things setup, as there is no relation
where my_room knows about my_house since it is simply kept in an array
variable inside my_house.


If you inherit Room < House then you can do something like this:
my_room.class.ancestors[1].respond_to?(type_of_house)

But that's at the class level (House) whereas you want the instance
(my_house) level.

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