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 <[EMAIL PROTECTED]
> 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
