On 03/11/2008, at 3:59 PM, Chuck Hill wrote:
On Nov 2, 2008, at 9:18 PM, Paul Hoadley wrote:
I'm sure I'm close to understanding this... thanks for bearing with
me.
On 03/11/2008, at 1:19 PM, Ken Anderson wrote:
On Nov 1, 2008, at 10:51 PM, Paul Hoadley wrote:
I've implemented it using HI, and it seems to be working. I'm
not convinced I have it quite right, though. There's another EO
in the utility-framework's model, UserPreference. UserPreference
has a to-one relationship with Person to denote the owner of the
preference. In the particular app, though, I'm now using
AMPersons, and hence the amperson table in the database---but
UserPreference.person relationship obviously looks for a Person
in the 'person' table, and there aren't any. To overcome this, I
have sub-classed UserPreference to create AMUserPreference, with
the only change being that the person relationship points to
AMPerson. This seems inelegant to me---am I doing it right? (Or
is this a candidate for the kind of dynamic model change you
refer to above?)
This is why it would be better for Person to be abstract, and have
different subentities for each application. That way,
UserPreference could have a relationship to the abstract Person
entity, which would automatically search all the subentities for
the correct one for that particular primary key.
I've made Person abstract in the model. I've deleted the redundant
EO (AMUserPreference), and UserPreference (which is in the same
framework as Person) points to the abstract Person entity. I no
longer generate a 'person' table, as I won't be instantiating Person.
That might be a bad idea. Some databases ( FrontBase) need this
base table for PK generation.
I'm using Postgres, but I've reverted to generating the table anyway.
I did notice that Entity Modeler is now generating SQL for an
amperson_seq sequence as a result of making Person abstract.
Now, where the app would create a UserPreference, I get this on
saving:
[2008-11-3 15:33:36 CST] <WorkerThread0>
<com.webobjects.appserver._private.WOComponentRequestHandler>:
Exception occurred while handling request:
java.lang.NullPointerException
Application.handleException: Handling an Exception:
java.lang.NullPointerException
at
com
.webobjects
.eoaccess
.EODatabaseContext
._verifyNoChangesToReadonlyEntity(EODatabaseContext.java:4696)
That is often caused by having a FK marked as a class property.
That is the first think that I would check.
I couldn't find anywhere I was doing that. Inexplicably, I had the PK
marked as a class property in both Person and AMPerson, so I've fixed
that.
I assume the "read only entity" is the newly-abstract Person. But
I don't have any Person entities---I've made Person.java an
abstract class.
I have some vague recollection that this can cause problems for
EOF. It might only be in specific situations and I no longer recall
any details. I have just avoided making abstract Java classes for
EOs for years.
Reverted.
Now, all I need to do is touch an AMPerson, for example by logging in,
and then on the next access to that table (for example, by logging
out, and then back in again) I get this:
[2008-11-3 16:53:8 CST] <WorkerThread2>
<com.webobjects.appserver._private.WOComponentRequestHandler>:
Exception occurred while handling request:
java.lang.IllegalStateException: rowDiffsForAttributes: snapshot in
com.webobjects.eoaccess.EODatabaseOperation {_dbSnapshot = {}; _entity
= "AMPerson"; _newRow = {lastName = "Hoadley"; lastLogin = 2008-11-03
06:23:08 Etc/GMT; id = 1; username = "super"; dob = 1973-06-07
14:30:00 Etc/GMT; password = "hFG6ihTXl1PTTLM7UbpGtLAl64E="; firstName
= "Paul"; lastPWChange = 2007-11-12 13:30:00 Etc/GMT; }; _object =
"PERSON: Paul Hoadley"; _globalID = _EOIntegralKeyGlobalID[AMPerson
(java.lang.Integer)1]; _databaseOperator =
"EODatabaseUpdateOperator"; } does not contain value for attribute
named contactDetailsID with snapshot key: contactDetailsID
Application.handleException: Handling an Exception:
java.lang.IllegalStateException: rowDiffsForAttributes: snapshot in
com.webobjects.eoaccess.EODatabaseOperation {_dbSnapshot = {}; _entity
= "AMPerson"; _newRow = {lastName = "Hoadley"; lastLogin = 2008-11-03
06:23:08 Etc/GMT; id = 1; username = "super"; dob = 1973-06-07
14:30:00 Etc/GMT; password = "hFG6ihTXl1PTTLM7UbpGtLAl64E="; firstName
= "Paul"; lastPWChange = 2007-11-12 13:30:00 Etc/GMT; }; _object =
"PERSON: Paul Hoadley"; _globalID = _EOIntegralKeyGlobalID[AMPerson
(java.lang.Integer)1]; _databaseOperator =
"EODatabaseUpdateOperator"; } does not contain value for attribute
named contactDetailsID with snapshot key: contactDetailsID
at
com
.webobjects
.eoaccess
.EODatabaseOperation.rowDiffsForAttributes(EODatabaseOperation.java:344)
at
com
.webobjects
.eoaccess
.EODatabaseContext
.createAdaptorOperationsForDatabaseOperationAttributes
(EODatabaseContext.java:5192)
at
com
.webobjects
.eoaccess
.EODatabaseContext
.createAdaptorOperationsForDatabaseOperation(EODatabaseContext.java:
5369)
at
com
.webobjects
.eoaccess.EODatabaseContext.performChanges(EODatabaseContext.java:6184)
at
com
.webobjects
.eocontrol
.EOObjectStoreCoordinator
.saveChangesInEditingContext(EOObjectStoreCoordinator.java:376)
at
com
.webobjects
.eocontrol.EOEditingContext.saveChanges(EOEditingContext.java:3176)
at net.logicsquad.am.Session.userLogin(Session.java:138)
at
net.logicsquad.am.components.pages.LogIn.loginButtonAction(LogIn.java:
54)
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:585)
at com.webobjects.foundation.NSKeyValueCoding$ValueAccessor
$1.methodValue(NSKeyValueCoding.java:636)
at com.webobjects.foundation.NSKeyValueCoding
$_MethodBinding.valueInObject(NSKeyValueCoding.java:1134)
at com.webobjects.foundation.NSKeyValueCoding
$DefaultImplementation.valueForKey(NSKeyValueCoding.java:1293)
at com.webobjects.appserver.WOComponent.valueForKey(WOComponent.java:
1686)
at com.webobjects.foundation.NSKeyValueCoding
$Utility.valueForKey(NSKeyValueCoding.java:447)
at com.webobjects.foundation.NSKeyValueCodingAdditions
$DefaultImplementation.valueForKeyPath(NSKeyValueCodingAdditions.java:
212)
at net.logicsquad.am.AMComponent.valueForKeyPath(AMComponent.java:153)
at
com
.webobjects
.appserver
._private
.WOKeyValueAssociation.valueInComponent(WOKeyValueAssociation.java:50)
at
com
.webobjects
.appserver._private.WOSubmitButton.invokeAction(WOSubmitButton.java:70)
at
com
.webobjects
.appserver
._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105)
at
com
.webobjects
.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115)
at com.webobjects.appserver._private.WOForm.invokeAction(WOForm.java:
141)
at
com
.webobjects
.appserver
._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105)
at
com
.webobjects
.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115)
at
com
.webobjects
.appserver
._private.WOComponentContent.invokeAction(WOComponentContent.java:38)
at
com
.webobjects
.appserver
._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105)
at
com
.webobjects
.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115)
at com.webobjects.appserver.WOComponent.invokeAction(WOComponent.java:
1078)
at
com
.webobjects
.appserver
._private.WOComponentReference.invokeAction(WOComponentReference.java:
127)
at
com
.webobjects
.appserver
._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105)
at
com
.webobjects
.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115)
at com.webobjects.appserver.WOComponent.invokeAction(WOComponent.java:
1078)
at
com
.webobjects
.appserver
._private.WOComponentReference.invokeAction(WOComponentReference.java:
127)
at
com
.webobjects
.appserver
._private.WODynamicGroup.invokeChildrenAction(WODynamicGroup.java:105)
at
com
.webobjects
.appserver._private.WODynamicGroup.invokeAction(WODynamicGroup.java:115)
at com.webobjects.appserver.WOComponent.invokeAction(WOComponent.java:
1078)
at com.webobjects.appserver.WOSession.invokeAction(WOSession.java:1357)
at
com.webobjects.appserver.WOApplication.invokeAction(WOApplication.java:
1736)
at
com
.webobjects
.appserver
._private
.WOComponentRequestHandler
._dispatchWithPreparedPage(WOComponentRequestHandler.java:206)
at
com
.webobjects
.appserver
._private
.WOComponentRequestHandler
._dispatchWithPreparedSession(WOComponentRequestHandler.java:298)
at
com
.webobjects
.appserver
._private
.WOComponentRequestHandler
._dispatchWithPreparedApplication(WOComponentRequestHandler.java:332)
at
com
.webobjects
.appserver
._private
.WOComponentRequestHandler
._handleRequest(WOComponentRequestHandler.java:369)
at
com
.webobjects
.appserver
._private
.WOComponentRequestHandler
.handleRequest(WOComponentRequestHandler.java:442)
at
com
.webobjects.appserver.WOApplication.dispatchRequest(WOApplication.java:
1678)
at
com
.webobjects
.appserver._private.WOWorkerThread.runOnce(WOWorkerThread.java:144)
at
com
.webobjects.appserver._private.WOWorkerThread.run(WOWorkerThread.java:
226)
at java.lang.Thread.run(Thread.java:613)
I seem to be fighting EOF pretty hard here.
--
Paul.
w http://logicsquad.net/
h http://paul.hoadley.name/
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