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From Andrus Adamchik <and...@objectstyle.org>
Subject Re: Using "relationship != null" qualifier with ObjEntity Inheritance
Date Wed, 06 Aug 2008 18:47:22 GMT
Ok, I see. This indeed is a limitation of the inheritance algorithm.  
We can't evaluate the inheritance qualifier expression in-memory in  
this case. We can probably improve on that in the future, but there is  
no easy fix.

Andrus


On Aug 6, 2008, at 2:29 PM, Dave Dombrosky wrote:

> Yes it is just a 1:1 mapping on the relationship.
>
> Here is the stack trace:
>
> org.apache.cayenne.exp.ExpressionException: [v.3.0-SNAPSHOT Aug 01
> 2008 19:55:10] Error evaluating expression 'db:some_relationship !=
> null'
> 	at  
> org.apache.cayenne.exp.parser.SimpleNode.evaluate(SimpleNode.java:331)
> 	at org.apache.cayenne.exp.Expression.match(Expression.java:367)
> 	at  
> org 
> .apache 
> .cayenne 
> .map 
> .EntityInheritanceTree.entityMatchingRow(EntityInheritanceTree.java: 
> 97)
> 	at  
> org 
> .apache 
> .cayenne 
> .map 
> .EntityInheritanceTree.entityMatchingRow(EntityInheritanceTree.java: 
> 83)
> 	at  
> org 
> .apache 
> .cayenne.access.ObjectResolver.objectFromDataRow(ObjectResolver.java: 
> 194)
> 	at  
> org 
> .apache 
> .cayenne 
> .access.ObjectResolver.objectsFromDataRows(ObjectResolver.java:121)
> 	at  
> org 
> .apache 
> .cayenne 
> .access 
> .ObjectResolver.synchronizedObjectsFromDataRows(ObjectResolver.java: 
> 101)
> 	at org.apache.cayenne.access.DataDomainQueryAction 
> $ObjectConversionStrategy.toObjects(DataDomainQueryAction.java:591)
> 	at org.apache.cayenne.access.DataDomainQueryAction 
> $SingleObjectConversionStrategy.convert(DataDomainQueryAction.java: 
> 661)
> 	at  
> org 
> .apache 
> .cayenne 
> .access 
> .DataDomainQueryAction 
> .interceptObjectConversion(DataDomainQueryAction.java:466)
> 	at  
> org 
> .apache 
> .cayenne 
> .access.DataDomainQueryAction.execute(DataDomainQueryAction.java:128)
> 	at org.apache.cayenne.access.DataDomain.onQuery(DataDomain.java:740)
> 	at  
> org 
> .apache 
> .cayenne 
> .util 
> .ObjectContextQueryAction.runQuery(ObjectContextQueryAction.java:317)
> 	at  
> org 
> .apache 
> .cayenne 
> .util.ObjectContextQueryAction.execute(ObjectContextQueryAction.java: 
> 96)
> 	at org.apache.cayenne.access.DataContext.onQuery(DataContext.java: 
> 1336)
> 	at  
> org.apache.cayenne.access.DataContext.performQuery(DataContext.java: 
> 1325)
> 	at  
> org.apache.cayenne.access.ToOneFault.doResolveFault(ToOneFault.java: 
> 82)
> 	at  
> org.apache.cayenne.access.ToOneFault.resolveFault(ToOneFault.java:55)
> 	at  
> org 
> .apache 
> .cayenne.CayenneDataObject.readProperty(CayenneDataObject.java:208)
> 	at  
> org 
> .apache 
> .cayenne.CayenneDataObject.setToOneTarget(CayenneDataObject.java:295)
>
> -Dave
>
>
> On Wed, Aug 6, 2008 at 11:59 AM, Andrus Adamchik <andrus@objectstyle.org 
> > wrote:
>> Could you post a bigger part of the stack trace (at least  
>> everything that
>> has org.apache.cayenne in it)?
>>
>> From what I can see, this is related to in-memory evaluation of the
>> qualifier. If that's a to-one relationship based on FK, intuitively  
>> this
>> should work, but it probably hits a limitation on in-memory  
>> evaluation.
>>
>> Andrus
>>
>>
>> On Aug 5, 2008, at 5:23 PM, Dave Dombrosky wrote:
>>
>>> I am currently trying to use ObjEntity Inheritance in my project,  
>>> but
>>> I am running into some difficulties.  I was hoping that I could use
>>> "someRelationship != null" as the qualifier, but I get the following
>>> error when trying to run the code:
>>>
>>> org.apache.cayenne.exp.ExpressionException: [v.3.0-SNAPSHOT Aug 01
>>> 2008 19:55:10] Error evaluating expression 'db:some_relationship !=
>>> null'
>>>
>>> Am I doing something wrong here, or did I find a bug?
>>>
>>> -Dave
>>>
>>
>>
>


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