Re: inheritance problem...
Re: inheritance problem...
- Subject: Re: inheritance problem...
- From: Tim Worman <email@hidden>
- Date: Mon, 4 Jan 2010 17:06:53 -0800
On Jan 4, 2010, at 4:39 PM, Chuck Hill wrote:
> 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.
Ya know - I'm feeling some deja vu about this. I probably am just ridiculous enough to reach a similar problem twice and have a conversation with you about it. Sorry if that's the case. Anyway, is this what you're suggesting?
TimesheetAbstract (no restricting qual)
TimesheetGeneric (1=0 or some such - I think I may have tried that qual before and it didn't work)
TimesheetExempt (isExempt=1)
TimesheetNonExempt (isExempt=0)
>> 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?
No, they can't. A Timesheet is either exempt or non-exempt because it belongs to a Job that is either exempt or non-exempt. That status can't change for a job or a timesheet so I'm guaranteed safe to model it if I can get it working.
> I think the best practices for restricting values are:
> 1. Don't try to be clever. Use E and N.
OK, I'm going to try and re-model it like that and see if it makes a difference.
> 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.
OK, thanks for that - I would not have done that for sure. :-)
Tim
> 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.
>>>>>>>>
>>>>>>>> *****
>>>>>>>> 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
>>>>>>>> *****
>>>>>>>>
>>>>>>>
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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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