Re: inheritance problem...
Re: inheritance problem...
- Subject: Re: inheritance problem...
- From: Chuck Hill <email@hidden>
- Date: Mon, 4 Jan 2010 16:39:03 -0800
On Jan 4, 2010, at 4:30 PM, Tim Worman wrote:
On Jan 4, 2010, at 4:00 PM, David Avendasora wrote:
On Jan 4, 2010, at 6:42 PM, Tim Worman wrote:
On Jan 4, 2010, at 3:27 PM, Chuck Hill wrote:
On Jan 4, 2010, at 3:13 PM, Tim Worman wrote:
Is it pretty much a certainty that the error I'm experiencing is
caused by a problem in my models? This problem is a show stopper
for me right now. Just for refresher, the error is:
Error: java.lang.IllegalStateException: The object with globalID
_EOIntegralKeyGlobalID[Timesheet (java.lang.Long)10253] could
not be found in the database. This could be result of a
referential integrity problem with the database. An empty fault
could not be created because the object's class could not be
determined (e.g. the GID is temporary or it is for an abstract
entity)
Does a Timesheet with a 10253 actually exist in the database? Is
Timesheet in an inheritance hierarchy? If so, check very, very
carefully for a duplicated PK.
Timesheet is in an inheritance hierarchy. From the original post,
this is how Timesheet is modeled:
Timesheet (abstract parent) <-----------------< TimeEntry (just
a time entry on a timesheet)
TimesheetExempt (child)
TimesheetNonExempt(child)
Yes, there is a Timesheet with timesheet_id=10253. There are no
Timesheet with duplicate timesheet_id. The error is thrown when
TimeEntry.timesheet() is called.
What is the restricting qualifier on each Timesheet entity?
Dave
Timesheet is abstract and does not have a restricting qualifier.
And that, IIRC, is your problem. Add one that matches nothing.
The entity has an attribute 'isExempt' which is boolean and modeled
using the toString approach. So, 'true' and 'false' are being stored
in the database. My restricting qualifiers for the child entities is
as follows:
TimesheetExempt: 'isExempt=1'
TimesheetNonExempt: 'isExempt=0'
Maybe I would be better off not using a boolean attribute and
instead have a string flag of with values of 'E' and 'N?' Then I
could put a cover method Timesheet.isExempt() to return the boolean.
Can Timesheets ever change from Exempt to Non-Exempt? Where is Kieran
to tell you to use the Role pattern for this? Kieran? Hello?
I think the best practices for restricting values are:
1. Don't try to be clever. Use E and N.
2. Don't use the restricting value for anything else. Ever.
public boolean isExempt() { return
TimesheetExempt.ENTITY_NAME.equals(entityName()));
or add another column, or something.
Chuck
Tim
Tim
Chuck
I've tested the equality of the connection dictionaries of the
models and they are equal.
Tim Worman
UCLA GSE&IS
On Dec 31, 2009, at 12:36 AM, Tim Worman wrote:
On Dec 30, 2009, at 3:18 AM, David Avendasora wrote:
On Dec 29, 2009, at 9:46 PM, Tim Worman wrote:
OK, so, I've reviewed all the prototypes in use, data types,
etc. I did find some areas where my prototypes were messed up
so it was worth it to go through it all. The fk and pk both
are long values.
But I'm still getting the same error. This solution also
doesn't cross databases. It does crosses models at this
point. But the TimeEntry and Timesheet entities are in the
same model.
If TimeEntry and Timesheet are in the same model, what crosses
models? The inheritance hierarchy? What type of Inheritance
are you using?
If you have two models that point to the same database you
have to be very careful to make sure that the connection
dictionaries of the two models are EXACTLY IDENTICAL (yelling
intended). This is very, very important. Otherwise they will
likely have different EODatabaseContexts which can cause all
manor of EOF confusion when it comes to assigning keys.
Read this thread from way back in 2006 where Mike Schrag
seemed to have a similar problem (start at the beginning): http://lists.apple.com/archives/webobjects-dev//2006/May/msg00530.html
Thanks Dave. But I still don't have a solution. I tested all
the models that refer to the same database. I'm testing the
equality of the connection dictionaries at app launch and they
all pass the connectionDictionary().equals() test. There is
another JNDI model that obviously refers to an LDAP data source
and necessarily the connection dictionary to that is different.
Any other ideas about what is causing the problem or
troubleshooting techniques you'd employ here? Obviously I'm
doing something wrong?
Tim
Dave
Tim Worman
UCLA GSE&IS
On Dec 28, 2009, at 4:45 PM, email@hidden wrote:
Check cross database issues and also name sure the types on
your pk and fk match ... I notice that says your fk is a
long, make sure that matches the pk of the destination entity.
Sent from my iPhone
On Dec 28, 2009, at 7:33 PM, "Tim
Worman"<email@hidden> wrote:
...or wondering if I've modeled something incorrectly.
I've got a model with these Entities:
Timesheet (abstract parent) >----------------- TimeEntry
(just a time entry on a timesheet)
TimesheetExempt (child)
TimesheetNonExempt(child)
Everything works fine until a given TimeEntry tries to
refer back to its timesheet by calling timesheet(). At that
point I get this error:
Error: java.lang.IllegalStateException: The object with
globalID _EOIntegralKeyGlobalID[Timesheet
(java.lang.Long)10253] could not be found in the database.
This could be result of a referential integrity problem
with the database. An empty fault could not be created
because the object's class could not be determined (e.g.
the GID is temporary or it is for an abstract entity)
It is true that the GID would be for an abstract entity -
Timesheet. But I assumed that a TimeEntry would not need to
know specifically what variety of Timesheet it is dealing
with. I guess the question I have is, what is the better
way to model this? Will it be necessary for me to model
TimeEntryExempt and TimeEntryNonExempt just so the time
entries know which type of timesheet they belong to and
don't call the abstract parent?
Tim
UCLA GSE&IS
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David Avendasora
Senior Software Engineer
K12, Inc.
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--
Chuck Hill Senior Consultant / VP Development
Practical WebObjects - for developers who want to increase their
overall knowledge of WebObjects or who are trying to solve
specific problems.
http://www.global-village.net/products/practical_webobjects
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David Avendasora
Senior Software Engineer
K12, Inc.
*****
WebObjects Documentation Wiki : http://wiki.objectstyle.org/confluence/display/WO/
*****
WebObjects API: http://developer.apple.com/legacy/mac/library/documentation/MacOSXServer/Reference/WO54_Reference/index.html
*****
--
Chuck Hill Senior Consultant / VP Development
Practical WebObjects - for developers who want to increase their
overall knowledge of WebObjects or who are trying to solve specific
problems.
http://www.global-village.net/products/practical_webobjects
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