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comp.lang.ruby

Is it possible to change the superclass of one class dynamic

Sean Liu

7/28/2008 3:47:00 AM


I want to change the super class of one class in one of plugins, for
example,
in plugin
class A < B

end
in rails initialization configuration file,
class A < C

end

but when i did this, the error: "TypeError: superclass mismatch"
appreared.

So can we change the super class of one class dynamically?

Thanks.
--
Posted via http://www.ruby-....
2 Answers

Chris Shea

7/28/2008 4:07:00 AM

0

On Jul 27, 9:47 pm, Sean Liu <seanli...@gmail.com> wrote:
> I want to change the super class of one class in one of plugins, for
> example,
> in plugin
> class A < B
>
> end
> in rails initialization configuration file,
> class A < C
>
> end
>
> but when i did this, the error: "TypeError: superclass mismatch"
> appreared.
>
> So can we change the super class of one class dynamically?
>
> Thanks.
> --
> Posted viahttp://www.ruby-....

No. That is not possible. It is, however, possible to include (and
extend) modules into a class to change its method and constant lookup
hierarchy.

What is it you're actually trying to accomplish by changing the
superclass?

Chris

Sean Liu

7/28/2008 4:50:00 AM

0

Chris Shea wrote:
> On Jul 27, 9:47�pm, Sean Liu <seanli...@gmail.com> wrote:
>>
>> but when i did this, the error: "TypeError: superclass mismatch"
>> appreared.
>>
>> So can we change the super class of one class dynamically?
>>
>> Thanks.
>> --
>> Posted viahttp://www.ruby-....
>
> No. That is not possible. It is, however, possible to include (and
> extend) modules into a class to change its method and constant lookup
> hierarchy.
>
> What is it you're actually trying to accomplish by changing the
> superclass?
>
> Chris

Thanks for quick reply, Chris.
I just want to change the behavior of one plugin without changing it's
source code. I think changing the original source code of that plugin
isn't too bad if we can't change the super class dynamically.
--
Posted via http://www.ruby-....