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Date: Wed, 25 Feb 2026 19:57:39 -0500
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Subject: Re: [WO-DEV] validateForSave() question
To: Aaron Rosenzweig <aaron@chatnbike.com>,
 WebObjects & WOnder Development <webobjects-dev@wocommunity.org>
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 <53AD1CD3-B098-4115-8197-8BCADC0E311D@chatnbike.com>
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From: Theodore Petrosky <tedpet5@yahoo.com>
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yea, it is a many to many. I put both validateForInsert and ForSave with 
logs to see them fire. I think I need to check for duplicates in the 
validateForSave.

so here is the quandary there is an entity Event. an event has a show 
and a show has an array of books. people are assigned to books. right 
now Jon is assigned to book 1 of event.show.LionKing.

If I edit the books (EditRelationshipEmbeddedEventBook) I can assign Jon 
to two books. This is what I am trying to eliminate. The possibility of 
a human error (that means that Jon gets paid twice.)

Whoops

Ideas?

Ted


On 2/23/26 7:52 PM, Aaron Rosenzweig wrote:
> If it’s strictly a toMany relationship, I don’t see how they could be added twice.
>
> Is it a many-to-many? In that case, the same person could be added twice. In that case, I’d put the validateForInsert() on the join table. I’d try to find at least one other join table pointing to the same person and entity.
>
>> On Feb 23, 2026, at 5:50 PM, Theodore Petrosky <tedpet5@yahoo.com> wrote:
>>
>> I am trying to add a check in validateForSave. my entity has a toMany relation with my Person entity. I need to  check if a person has been added twice.
>>
>> So basically, if Jon has been added twice throw the validation exception. so I guess, here is an array of persons, are they all unique?
>>
>> Am I being clear?
>>
>> public void validateForSave() throws NSValidation.ValidationException {
>>
>> Ted
>>
>> BTW, I tried to send this to webobjects-dev@lists.apple.com, but it looks like it has been down for a couple of days or longer.
>>
>>
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