Re: Help with optional to-one relationship
Re: Help with optional to-one relationship
- Subject: Re: Help with optional to-one relationship
- From: Ken Anderson <email@hidden>
- Date: Fri, 28 Aug 2009 00:01:24 -0400
This relationship is not guaranteed to be to-one, since there could be
many States that match the Seo's ID.
The way I deal with this is to model it as a to-many relationship, and
write methods in the EO that set/get, enforcing the to-one concept.
On Aug 27, 2009, at 10:28 PM, Amiel Montecillo wrote:
Hello,
I have a to-one relationship that is giving me problems when
updating the destination entity.
class Seo
{
id; <- PK
title;
description;
state() <- reverse to-one relationship to State
}
class State
{
id; <- PK
name;
seoid; <- FK to Seo (id)
seo(); <- optional to-one relationship to Seo
}
When I first enter an Seo to a State, all seems fine, all properties
of Seo are saved and are related to the corresponding State. But
then, when I update it I get this exception.
Unable to map destination State for relationship state in entity
Seo. To one relationships must be joined on the primary key of the
destination.
java.lang.IllegalArgumentException: Unable to map destination State
for relationship state in entity Seo. To one relationships must be
joined on the primary key of the destination.
at
com
.webobjects
.eoaccess
.EORelationship._sourceRowToForeignKeyMapping(EORelationship.java:
1134)
at
com
.webobjects
.eoaccess.EORelationship._foreignKeyForSourceRow(EORelationship.java:
1148)
at
com
.webobjects
.eoaccess
.EODatabaseContext
._objectFaultWithSnapshotRelationshipEditingContext
(EODatabaseContext.java:2346)
at
com
.webobjects
.eoaccess
.EODatabaseContext
._fireDeferredFaultWithSourceObject(EODatabaseContext.java:2401)
at
com
.webobjects
.eoaccess
.EOAccessDeferredFaultHandler
.createFaultForDeferredFault(EOAccessDeferredFaultHandler.java:49)
at
com
.webobjects
.eocontrol.EOCustomObject.willReadRelationship(EOCustomObject.java:
1279)
at
er
.extensions
.eof.ERXGenericRecord.willReadRelationship(ERXGenericRecord.java:358)
at com.webobjects.eocontrol._EOMutableKnownKeyDictionary
$Initializer
$
_LazyGenericRecordBinding
.valueInObject(_EOMutableKnownKeyDictionary.java:614)
at
com
.webobjects
.eocontrol.EOCustomObject.storedValueForKey(EOCustomObject.java:1634)
at
com.webobjects.eocontrol.EOCustomObject.snapshot(EOCustomObject.java:
525)
at
com
.webobjects
.eocontrol.EOEditingContext.objectWillChange(EOEditingContext.java:
2813)
at er.extensions.eof.ERXEC.objectWillChange(ERXEC.java:769)
at
com
.webobjects
.eocontrol
.EOObserverCenter
.notifyObserversObjectWillChange(EOObserverCenter.java:399)
at
com
.webobjects.eocontrol.EOCustomObject.willChange(EOCustomObject.java:
333)
at com.webobjects.eocontrol._EOMutableKnownKeyDictionary
$Initializer
$
_GenericRecordBinding
.setValueInObject(_EOMutableKnownKeyDictionary.java:579)
at
com
.webobjects
.eocontrol.EOCustomObject.takeStoredValueForKey(EOCustomObject.java:
1663)
at
er
.extensions
.eof.ERXGenericRecord.takeStoredValueForKey(ERXGenericRecord.java:
1290)
at com.bossing.wo.bids.db._Seo.setDescription(_Seo.java:52)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun
.reflect
.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun
.reflect
.DelegatingMethodAccessorImpl
.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.webobjects.foundation.NSKeyValueCoding$ValueAccessor
$1.setMethodValue(NSKeyValueCoding.java:643)
at com.webobjects.foundation.NSKeyValueCoding
$_MethodBinding.setValueInObject(NSKeyValueCoding.java:1150)
at
com
.webobjects
.eocontrol.EOCustomObject.takeValueForKey(EOCustomObject.java:1529)
at
er
.extensions
.eof.ERXGenericRecord.takeValueForKey(ERXGenericRecord.java:1282)
at com.webobjects.foundation.NSKeyValueCoding
$Utility.takeValueForKey(NSKeyValueCoding.java:469)
at com.webobjects.foundation.NSValidation
$DefaultImplementation.validateTakeValueForKeyPath(NSValidation.java:
679)
at
com
.webobjects
.eocontrol
.EOCustomObject.validateTakeValueForKeyPath(EOCustomObject.java:1335)
at com.webobjects.foundation.NSValidation
$Utility.validateTakeValueForKeyPath(NSValidation.java:502)
at com.webobjects.foundation.NSValidation
$DefaultImplementation.validateTakeValueForKeyPath(NSValidation.java:
687)
at
com
.webobjects
.eocontrol
.EOCustomObject.validateTakeValueForKeyPath(EOCustomObject.java:1335)
at com.webobjects.foundation.NSValidation
$Utility.validateTakeValueForKeyPath(NSValidation.java:502)
Is my entity modeling correct? Any ideas how I can resolve this?
Thanks,
Amiel
--
socket error: unable to connect to 127.0.0.1
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