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Re: uniqueness constraint on an a foreign key
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Re: uniqueness constraint on an a foreign key


  • Subject: Re: uniqueness constraint on an a foreign key
  • From: Chuck Hill <email@hidden>
  • Date: Mon, 22 Sep 2008 10:07:17 -0700


On Sep 20, 2008, at 6:40 AM, Florijan Stamenkovic wrote:


On Sep 19, 2008, at 16:20, Chuck Hill wrote:

I was thinking more of having A and B each have the other PK as a FK.

Huh... Have you ever done this? Anyone else?

I have played around with it, I don't recall if I used it or not.



Though this may irritate EOF when it tries to look up inverse relationships. You can tell EOF what to do by implementing String inverseForRelationshipKey(String relationshipKey) on A and B.

Yeah, sounds like this might end up kicking me in the ass. Especially since I can't override client side class descriptions, so I would have a discrepancy between what EOs and class descriptions see as inverse relationships. Not sure I like this idea, it might have unforeseeable consequences, no? More work...

Does that method exist for client side EOs?


But, to come back on the original idea, what do you think of putting a uniqueness constraint on the FK? Would that somewhere somehow screw the object graph up beyond repair?


I can't see how it would harm it.  If violated, the save will fail.

Chuck

--
Chuck Hill             Senior Consultant / VP Development

Practical WebObjects - for developers who want to increase their overall knowledge of WebObjects or who are trying to solve specific problems.
http://www.global-village.net/products/practical_webobjects







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  • Follow-Ups:
    • Re: uniqueness constraint on an a foreign key
      • From: Florijan Stamenkovic <email@hidden>
References: 
 >uniqueness constraint on an a foreign key (From: Florijan Stamenkovic <email@hidden>)
 >Re: uniqueness constraint on an a foreign key (From: Chuck Hill <email@hidden>)
 >Re: uniqueness constraint on an a foreign key (From: Florijan Stamenkovic <email@hidden>)
 >Re: uniqueness constraint on an a foreign key (From: Chuck Hill <email@hidden>)
 >Re: uniqueness constraint on an a foreign key (From: Florijan Stamenkovic <email@hidden>)
 >Re: uniqueness constraint on an a foreign key (From: Chuck Hill <email@hidden>)
 >Re: uniqueness constraint on an a foreign key (From: Florijan Stamenkovic <email@hidden>)

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