Re: [Wonder-disc] ERXEOControlUtilities.objectsInRange not working with abstract EOs?

[Dominique S. <dom...@ci...>]

You needs to subclass ERXDatabaseContextDelegate like this:

public void databaseContextDidSelectObjects(EODatabaseContext dc,
												EOFetchSpecification fs,
												EODatabaseChannel channel) {
		if (fs.entityName().equals("....")) // or whatever condition you  
may need
			channel._isFetchingSingleTableEntity = true;
	}

The goal is to access the _isFetchingSingleTableEntity flag of the  
EODatabaseChannel in order to put it to true in order that EOF take  
care of the EOEntity subclasses and create the objects of the right  
subclass !! I give more explanation in a post in the EOF omnigroup  
news group.

Note: To access the isFetchingSingleTableEntity which is protected,  
the EODatabaseContext delegate needs to be a in  the   
com.webobjects.eoaccess package...

On 22 juil. 06, at 14:57, Marc Gumpinger wrote:

> Hi,
>
> when I use ERXEOControlUtilities.objectsInRange with a fetch spec  
> that fetches an abstract enterprise object, I get the following  
> exception.
> However, when using the very same fetch spec on the editing  
> context's good old objectsWithFetchSpecification, everything works  
> fine.
>
> Does ERXEOControlUtilities.objectsInRange not work with abstract  
> EOs or am I doing anything wrong here?
>
>
> Regards
> Marc
>
>
>
> [2006-07-22 14:48:36 CEST] <main> A fatal exception occurred: null:  
> <net.gumpinger.vilfredo.eos.AbstractAnswer> is an abstract class.  
> It can not be instantiated !
> [2006-07-22 14:48:36 CEST] <main>  
> com.webobjects.foundation.NSForwardException for  
> java.lang.InstantiationException
> 	at  
> sun.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance( 
> InstantiationExceptionConstructorAccessorImpl.java:30)
> 	at java.lang.reflect.Constructor.newInstance(Constructor.java:274)
> 	at  
> com.webobjects.foundation._NSUtilities.instantiateObjectWithConstructo 
> r(_NSUtilities.java:594)
> 	at  
> com.webobjects.eoaccess.EOEntityClassDescription.createInstanceWithEdi 
> tingContext(EOEntityClassDescription.java:207)
> 	at com.webobjects.eoaccess.EODatabaseChannel._fetchObject 
> (EODatabaseChannel.java:417)
> 	at  
> com.webobjects.eoaccess.EODatabaseContext._objectsWithFetchSpecificati 
> onEditingContext(EODatabaseContext.java:3222)
> 	at  
> com.webobjects.eoaccess.EODatabaseContext.objectsWithFetchSpecificatio 
> n(EODatabaseContext.java:3347)
> 	at  
> com.webobjects.eocontrol.EOObjectStoreCoordinator.objectsWithFetchSpec 
> ification(EOObjectStoreCoordinator.java:539)
> 	at  
> com.webobjects.eocontrol.EOEditingContext.objectsWithFetchSpecificatio 
> n(EOEditingContext.java:4075)
> 	at  
> com.webobjects.eocontrol.EOEditingContext.objectsWithFetchSpecificatio 
> n(EOEditingContext.java:4461)
> 	at er.extensions.ERXEOControlUtilities.objectsInRange 
> (ERXEOControlUtilities.java:438)
>
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