Re: Ordered list of arbitrary objects

You might also want to have a look at ExtendableBehavior or
InheritableBehavior (check the Bakery)

On Wed, Feb 25, 2009 at 4:41 PM, mscdex <mscdex@gmail.com> wrote:
>
> One approach you may wish to take is to do the subclassing in the
> database itself.
>
> First, have a superclass table which contains the common attributes
> shared among all the subclasses, along with the normal primary key
> 'id' attribute. Then create a table for each subclass that has a
> primary key (in addition to subclass-specific attributes of course)
> that points to a record in the superclass table. With all of that set
> up, you can then order the superclass table. The are two additional
> things you have to do when using this method. One is that you would
> have to ensure the specialization constraint (disjoint or overlap) for
> the subclasses isn't violated. The second is that the superclass's
> type of participation (total or partial) in the specialization should
> be enforced.
>
> There are several ways to do this sort of thing strictly in the
> database, but the aforementioned way is usually the recommended
> solution.
> >
>

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