Fabio, I really don't know what to make of your answer.
On Dec 19, 6:45 am, "Fabio Maulo" <[email protected]> wrote:
> epitka... we have another concept....Who are using your class is your friend
> and he is not a terrorist.
>
> 2008/12/19 epitka <[email protected]>
>
>
>
>
>
> > But how do you protect your collection from being changed; exposing it
> > as read-only? But that is not intuitive, if client does not know that
> > AddPerson is to be used you would get exception.
> > Why is #2 not viable?
>
> > On Dec 18, 9:29 pm, "Greg Young" <[email protected]> wrote:
> > > 1. don't let collection be modified directly but use Add/remove and
> > > enforce rule there
>
> > > Have the aggregate root enforce the validation.
>
> > > Cheers,
>
> > > Greg
>
> > > On Thu, Dec 18, 2008 at 7:25 PM, epitka <[email protected]> wrote:
>
> > > > This is probably more a DDD question then NH. Let say you have
> > > > observable collections that raise events before collection gets
> > > > changed and after. Let's say you have a rule that only person's over
> > > > 21 can be added to the collection. How would you handle this rule:
> > > > 1. don't let collection be modified directly but use Add/remove and
> > > > enforce rule there
> > > > 2. create delegate that will check rule in OnChanging step and veto
> > > > change
> > > > 3. allow person to be added and run validate before persisting entity
> > > > using NH events, basically allow entity to get into invalid state
> > > > 4. manually invoke validation before commiting changes.
> > > > 5. something else ?
>
> > > --
> > > It is the mark of an educated mind to be able to entertain a thought
> > > without accepting it.
>
> --
> Fabio Maulo
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