Rails - Jan 2009 - Can I "fake" an object model on top of a flat ActiveRecord?

This might be a painfully bad idea, but it''s gotten me curious.  I have
a generic object Node, which has a name attribute.  Say for example that
one of the names is "Widget".

What I''m wondering is, is there a way to manipulate ActiveRecord to
make
a class  named Widget, that behaves exactly like a Node with the only
difference being that all operations only work on the condition
(name="Widget") is true?  I can do a simple    class Widget < Node 
to
get it started, but I''m looking for what the next line would be, where
I
can specify the global condition.  In all other cases,

History : The database itself is generated rather, well, generically by
scanning a file where I don''t know the nature of the content beyond
simple node relationships (i.e. I don''t know ahead of time all values
for "name").  However, I''m thinking that after the flat data
storage
portion is taken care of I could go in and maybe write some sort of
generator for myself that would build up the Ruby classes to deal with
the database, and hide the whole thing.
-- 
Posted via http://www.ruby-forum.com/.

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I''m not completely clear on what your trying to accomplish but it
sounds like STI may be what your looking for?

http://wiki.rubyonrails.org/rails/pages/singletableinheritance

Good luck!
Tim

On Jan 28, 3:40 pm, Duane Morin
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
> This might be a painfully bad idea, but it''s gotten me curious.  I
have
> a generic object Node, which has a name attribute.  Say for example that
> one of the names is "Widget".
>
> What I''m wondering is, is there a way to manipulate ActiveRecord
to make
> a class  named Widget, that behaves exactly like a Node with the only
> difference being that all operations only work on the condition
> (name="Widget") is true?  I can do a simple    class Widget <
Node   to
> get it started, but I''m looking for what the next line would be,
where I
> can specify the global condition.  In all other cases,
>
> History : The database itself is generated rather, well, generically by
> scanning a file where I don''t know the nature of the content
beyond
> simple node relationships (i.e. I don''t know ahead of time all
values
> for "name").  However, I''m thinking that after the flat
data storage
> portion is taken care of I could go in and maybe write some sort of
> generator for myself that would build up the Ruby classes to deal with
> the database, and hide the whole thing.
> --
> Posted viahttp://www.ruby-forum.com/.
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You know, that might be exactly it.  I knew I''d heard it somewhere 
before :).

Thanks!  Sorry for the interruption.

D
Duane Morin wrote:
> This might be a painfully bad idea, but it''s gotten me curious.  I
have
> a generic object Node, which has a name attribute.  Say for example that
> one of the names is "Widget".
> 
> What I''m wondering is, is there a way to manipulate ActiveRecord
to make
> a class  named Widget, that behaves exactly like a Node with the only
> difference being that all operations only work on the condition
> (name="Widget") is true?  I can do a simple    class Widget <
Node   to
> get it started, but I''m looking for what the next line would be,
where I
> can specify the global condition.  In all other cases,
> 
> History : The database itself is generated rather, well, generically by
> scanning a file where I don''t know the nature of the content
beyond
> simple node relationships (i.e. I don''t know ahead of time all
values
> for "name").  However, I''m thinking that after the flat
data storage
> portion is taken care of I could go in and maybe write some sort of
> generator for myself that would build up the Ruby classes to deal with
> the database, and hide the whole thing.
-- 
Posted via http://www.ruby-forum.com/.

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For more options, visit this group at
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