RE: Dumb (?) subclass question

Thomas,

You answered your own question :)  Yes, ITEM should have typ !=3D 'E' =
(or maybe typ <> 'E') to make sure that you don't get ITEM and ITEM_E =
duplicates.

Ken

-----Original Message-----
From: [email protected] [mailto:[email protected]]On
Behalf Of Thomas Ganter
Sent: Friday, January 07, 2005 5:04 AM
To: Chuck Hill
Cc: [email protected]
Subject: Re: Dumb (?) subclass question


Hi Chuck,

I can rule out to accidentially create duplicates. There is no way=20
where this could happen.
And this reproducably happens for every single items() relationship I=20
do on any arbitrary HEAD element.

In my EO subclass of ITEM, which is ITEM_E, I have entered the=20
qualifier "(typ=3D'E')" in the advanced entity inspector, with "typ"=20
being a class property.

The idea is to have items() retrieve all ITEM elements, whereas=20
item_es() only retrieve special ones.

Do I need to have a qualifier in the "ITEM" properties as well?

Greetings,

- Thomas

Am 07.01.2005 um 03:12 schrieb Chuck Hill:

> Yes, you probably did something wrong in setting up the subclass.  We=20
> will need more details (single table, vertical, horizontal=20
> inheritance) to discern why.  As a guess, you forgot the restricting=20
> qualifier.
>
> If not that, then  perhaps you are manually adding a duplicate in your =

> code though incorrect use of EOF?
>
> Chuck
>
>
> On Jan 6, 2005, at 5:08 PM, Thomas Ganter wrote:
>
>> Hi all,
>>
>> I just spent four hours searching for a bug when I found a situation=20
>> in which a to-many relationship always contained duplicate elements.
>> I always was under the impression that the array I get will contain=20
>> distinct rows and never checked for duplicates.
>>
>> Let's say there are two tables: HEAD and ITEM with a 1:n =
relationship.
>>
>> Whenever I say (HEAD)h.items(), I get four entries in the NSArray=20
>> when in the database there are only three.
>>
>> Could this be somehow due to the fact that i sublassed ITEM?
>>
>> If so, how can I prevent this behaviour?
>>
>> Greetings,
>>
>> - Thomas
>>
>> _______________________________________________
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>>
> --=20
> Practical WebObjects - a book for intermediate WebObjects developers=20
> who want to increase their overall knowledge of WebObjects, or those=20
> who are trying to solve specific application development problems.
> http://www.global-village.net/products/practical_webobjects
>
>
>

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