Re: Is it suitable using STI?

Greg Akins
Thu, 10 May 2012 15:05:10 -0000

On Thu, May 10, 2012 at 10:57 AM, Mauro
<mrsanna1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:

> I have problems on a simple design problem.
> I have many companies. Each company have one or more commercial activity.
> Activities types are: ecommerce, local unit, television, automatic
> vending machines, and so on.
>

So can each Company have many CommercialActivities

Then.. CommercialActivity is STI, which means it has a type column and
sub-types can be ECommerceActivity, TelevisionActivity, etc..

The only warning is that if each type is dramatically different, you might
want to investigate doing it with multiple tables so you dont have a lot of
redundant fields trying model things with additional attributes that
aren''t
shared.

I think this post might help you
http://stackoverflow.com/questions/1634668/multiple-table-inheritance-vs-single-table-inheritance-in-ruby-on-rails

--
Greg Akins