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Re: Empty relationship that isn't null
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Re: Empty relationship that isn't null


  • Subject: Re: Empty relationship that isn't null
  • From: Chuck Hill <email@hidden>
  • Date: Wed, 18 May 2005 13:12:59 -0700

We are talking about a specific object that is related to a specific row in the database. Does that row have a non-null value for the EntityB FK? If so, is it valid or do you have a referential integrity problem in your data? If you have a referential integrity problem (which is what it sounds like), then you are seeing what is called a "Dummy Fault EO" see http://lists.apple.com/archives/webobjects-dev/2003/Aug/msg00433.html and other Google hits.


Chuck


On May 18, 2005, at 12:46 PM, DevReseune wrote:

Hi,

It's an optional to-one relationship, there is none EntityB in database, and the entityB FK is null by default, but this property is hidden (not the related object, but its ID).

I don't understand.


Frédéric

Le 16 mai 05 à 21:24, Chuck Hill a écrit :

This is a to-one relationship? Is it marked as optional or mandatory? Is the entityB FK in the EntityA object null, or does it have a value?

Chuck

On May 16, 2005, at 11:19 AM, DevReseune wrote:


Hi,

I have 2 entities bound with a relationship:
    - EntityA
        - entityB -> EntityB
    - EntityB

When I fetch an EntityA, the relationship entityB is initialited with an EOAccessDeferredFaultHandler (takeStoredValueForKey) while the SQL select statement returns 0 row.

When I try to access to the relationship entityB, it is updated with an _EOVectorKeyGlobalID (takeStoredValueForKey).

But, I expected a null value. What's the problem?

Webobjects 5.2.4
MacOS X Tiger (I have the same behavior on X.3).



Frédéric _______________________________________________
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http://www.global-village.net/products/practical_webobjects




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  • Follow-Ups:
    • Re: Empty relationship that isn't null
      • From: Ken Anderson <email@hidden>
References: 
 >Empty relationship that isn't null (From: DevReseune <email@hidden>)
 >Re: Empty relationship that isn't null (From: Chuck Hill <email@hidden>)
 >Re: Empty relationship that isn't null (From: DevReseune <email@hidden>)

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