Re: Is it suitable using STI?

Jeremy Walker
Thu, 10 May 2012 15:07:51 -0000

On 10 May 2012 16:05, Greg Akins
<angrygreg-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:

>
>
> 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
>
>

You can also use a project of mine (Super STI) to help you. It helps you
use STI in Rails while keeping your database clean. Read about it at
https://github.com/ihid/super_sti  and
http://www.ihid.co.uk/projects/super_sti

Message me off-list if you want some help with using it.


>  --
> Greg Akins
> http://twitter.com/akinsgre
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