Apple

On 2015-03-16, at 5:09 PM, Chuck Hill wrote:

Hi Calven,

ERXDatabaseContextDelegate.databaseContextFailedToFetchObject will explain what you are seeing. You can see the property er.extensions.ERXDatabaseContextDelegate.tolerantEntityPattern to avoid this behaviour but The best thing to do here is to ensure that your database has referential integrity. :-) The FK should be null not zero so that the first line will return pgEO == null which you should then check before the second line to avoid the dreaded NPE. You code is relying on the behaviour of a dummy fault EO: http://lists.apple.com/archives/webobjects-dev/2008/Sep/msg00208.html

Chuck

On 2015-03-16, 1:22 PM, "Calven Eggert" wrote:

In moving a project over to Project Wonder, I'm happy to say that things are going very smoothly.  Today I've come across an issue with this code:

EOEnterpriseObject pgEO = (EOEnterpriseObject) currentTrial.valueForKey("programGrouping");

        String programGroupingStr = (String) pgEO.valueForKeyPath("displayName");

return programGroupingStr;

Previously when pgEO did not exist, (a valid result)  the code would continue to run and I'd simply get null in programGroupingStr. The value for the pgEO after line one is this:

{values = {programGroupingId = <com.webobjects.foundation.NSKeyValueCoding$Null>; displayName = <com.webobjects.foundation.NSKeyValueCoding$Null>; bixidentity = "null"; }; this = "<com.webobjects.eocontrol.EOGenericRecord 7e6bc5aa _EOIntegralKeyGlobalID[BIXProgramGrouping (java.lang.Integer)0]>"; }

Now using Project Wonder, the value of pgEO becomes:

<er.extensions.eof.ERXGenericRecord pk:"0">

and when trying to execute the second line:

ObjectNotAvailableException: No er.extensions.eof.ERXGenericRecord found with globalID: <BIXProgramGrouping: [programGroupingId: '0']

What is the best way to deal with this scenario?

Calven

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References:
	>ObjectNotAvailableException vs NSKeyValueCoding$Null (From: Calven Eggert <email@hidden>)
	>Re: ObjectNotAvailableException vs NSKeyValueCoding$Null (From: Chuck Hill <email@hidden>)