Re: WOToManyRelationship trouble

Subject: Re: WOToManyRelationship trouble
From: Amedeo Mantica <email@hidden>
Date: Fri, 20 May 2005 21:30:50 +0200

Hi Chuck,

I re-read my documentation about relationships...

I changed way to insert the accessories

If i do, as in most WO examples, ad add accesssory function to the car, then set the relationship before i actually insert the accessory object works fine. and if i go later in the accessory object the WOToManyRelationship works and allow me tho change relation.

Doing so the user must insert the car, then add an accessory to the car inside the car pages clicking (add accessory for this car), but is not user friendly. My goal was to insert all the cars into the database, and then the accessories, showind in the new accessory page the list of cars available via the TOManyRelationship extension. Looking for a workaround.. :=) Thanks for your help, if you have some more suggestion.... thanks again Amedeo


On 20/mag/05, at 19:09, Chuck Hill wrote:

On May 20, 2005, at 9:59 AM, Amedeo Mantica wrote:
maybe...
what you mean?
the accessiories is in the editing contect, non the car (the relating to object).
That is your problem. See http://wodev.spearway.com/cgi-bin/ WebObjects/WODev.woa/wa/Main?wikiPage=EOFCommandments
how can i insert the cars into the editing context if is occupied my the accessory?

It seems that you do not understand how these objects work. I suggest that you take a break and read some of the EOF documentation and look at how some of the example and tutorials work.
Chuck
On 20/mag/05, at 18:05, Chuck Hill wrote:
Are you relating the Accessories to an object that has not yet been inserted into an editing context?
Chuck
On May 20, 2005, at 3:50 AM, Amedeo Mantica wrote:
thanks for the help, but still having trouble
the binding seem to be set correctly
the sourceObject is binded to the Accessioruis Object the source entity name is binded to the entity name of the accessorio object in eomodeler the relationshipkey is binded to the relationship name in eomodeler

teh component correcly display the list of available cars in the page, but when i click submit i got the error. Do anyone have an example usign the WOToManyRealationship extension? Thanks Amedeo
On 20/mag/05, at 02:47, Chuck Hill wrote:
The source for these components is on your machine at
/Developer/Examples/JavaWebObjects/Source/JavaWOExtensions
This is where the execption happens, last line:
    public void updateSourceObject(NSArray newValues) {
// add new values to relationship, remove old values Object aSourceObject = _localSourceObject(); boolean isDictionary = (aSourceObject instanceof NSMutableDictionary); NSMutableDictionary _dictionary = (isDictionary) ? (NSMutableDictionary) aSourceObject : null; EOEnterpriseObject _eo = (!isDictionary) ? (EOEnterpriseObject) aSourceObject : null; String masterKey = _localRelationshipKey(); NSMutableArray currentValues = (NSMutableArray) NSKeyValueCoding.Utility.valueForKey(aSourceObject, masterKey); int count = currentValues.count();

Thus, NSKeyValueCoding.Utility.valueForKey(aSourceObject, masterKey) returns null. In other words, sourceObject.valueForKey(masterKey) returns null. Check the spelling of your bindings. It looks like you have misspelled the tomany relation.
Chuck
On May 19, 2005, at 12:18 PM, Amedeo Mantica wrote:
Here the exception:
Any help apprecciated!
THANKS
Error:
java.lang.NullPointerException
Reason:
Stack trace:
File
Line#
Method
Package
WOToManyRelationship.java
348
updateSourceObject
com.webobjects.woextensions
WOToManyRelationship.java
421
setSelections
com.webobjects.woextensions
NativeMethodAccessorImpl.java
NA
invoke0
sun.reflect
NativeMethodAccessorImpl.java
39
invoke
sun.reflect
DelegatingMethodAccessorImpl.java
25
invoke
sun.reflect
Method.java
324
invoke
java.lang.reflect
NSKeyValueCoding.java
688
setMethodValue
com.webobjects.foundation
NSKeyValueCoding.java
1175
setValueInObject
com.webobjects.foundation
NSKeyValueCoding.java
1293
takeValueForKey
com.webobjects.foundation
WOComponent.java
1550
takeValueForKey
com.webobjects.appserver
NSKeyValueCoding.java
519
takeValueForKey
com.webobjects.foundation
NSValidation.java
733
validateTakeValueForKeyPath
com.webobjects.foundation
WOComponent.java
1273
validateTakeValueForKeyPath
com.webobjects.appserver
WOKeyValueAssociation.java
71
setValue
com.webobjects.appserver._private
WOComponent.java
756
setValueForBinding
com.webobjects.appserver
WOCheckboxMatrix.java
108
setSelections
com.webobjects.woextensions
NativeMethodAccessorImpl.java
NA
invoke0
sun.reflect
NativeMethodAccessorImpl.java
39
invoke
sun.reflect
DelegatingMethodAccessorImpl.java
25
invoke
sun.reflect
Method.java
324
invoke
java.lang.reflect
NSKeyValueCoding.java
688
setMethodValue
com.webobjects.foundation
NSKeyValueCoding.java
1175
setValueInObject
com.webobjects.foundation
NSKeyValueCoding.java
1293
takeValueForKey
com.webobjects.foundation
WOComponent.java
1550
takeValueForKey
com.webobjects.appserver
NSKeyValueCoding.java
519
takeValueForKey
com.webobjects.foundation
NSValidation.java
733
validateTakeValueForKeyPath
com.webobjects.foundation
WOComponent.java
1273
validateTakeValueForKeyPath
com.webobjects.appserver
WOKeyValueAssociation.java
71
setValue
com.webobjects.appserver._private
WOGenericElement.java
74
takeValuesFromRequest
com.webobjects.appserver._private
WOGenericContainer.java
16
takeValuesFromRequest
com.webobjects.appserver._private
WODynamicGroup.java
81
takeChildrenValuesFromRequest
com.webobjects.appserver._private
WODynamicGroup.java
89
takeValuesFromRequest
com.webobjects.appserver._private
WOComponent.java
914
takeValuesFromRequest
com.webobjects.appserver
WOComponentReference.java
97
takeValuesFromRequest
com.webobjects.appserver._private
WODynamicGroup.java
81
takeChildrenValuesFromRequest
com.webobjects.appserver._private
WODynamicGroup.java
89
takeValuesFromRequest
com.webobjects.appserver._private
WOConditional.java
41
takeValuesFromRequest
com.webobjects.appserver._private
WODynamicGroup.java
81
takeChildrenValuesFromRequest
com.webobjects.appserver._private
WODynamicGroup.java
89
takeValuesFromRequest
com.webobjects.appserver._private
WOComponent.java
914
takeValuesFromRequest
com.webobjects.appserver
WOComponentReference.java
97
takeValuesFromRequest
com.webobjects.appserver._private
WODynamicGroup.java
81
takeChildrenValuesFromRequest
com.webobjects.appserver._private
WODynamicGroup.java
89
takeValuesFromRequest
com.webobjects.appserver._private
WOForm.java
70
takeValuesFromRequest
com.webobjects.appserver._private
WODynamicGroup.java
81
takeChildrenValuesFromRequest
com.webobjects.appserver._private
WODynamicGroup.java
89
takeValuesFromRequest
com.webobjects.appserver._private
WOComponent.java
914
takeValuesFromRequest
com.webobjects.appserver
WOSession.java
1139
takeValuesFromRequest
com.webobjects.appserver
WOApplication.java
1350
takeValuesFromRequest
com.webobjects.appserver
WOComponentRequestHandler.java
189
_dispatchWithPreparedPage
com.webobjects.appserver._private
WOComponentRequestHandler.java
287
_dispatchWithPreparedSession
com.webobjects.appserver._private
WOComponentRequestHandler.java
322
_dispatchWithPreparedApplication
com.webobjects.appserver._private
WOComponentRequestHandler.java
358
_handleRequest
com.webobjects.appserver._private
WOComponentRequestHandler.java
432
handleRequest
com.webobjects.appserver._private
WOApplication.java
1306
dispatchRequest
com.webobjects.appserver
WOWorkerThread.java
173
runOnce
com.webobjects.appserver._private
WOWorkerThread.java
254
run
com.webobjects.appserver._private
Thread.java
552
run
java.lang
NA : Non applicable, JIT activated
On 18/mag/05, at 19:39, Chuck Hill wrote:
On May 18, 2005, at 1:59 AM, Amedeo Mantica wrote:
Hi, I have a DB with this entinies: Cars and Accesories...
I need to do a to many relationship between this two entities
a Car can have many Accessories
I made the relationship with EOModeler without any problem, than added in my accessiories component page a WOToManyRelationship binding the relationshipkey with the name of the relationship, the sourceObject with the accessiories object and the source entity name with tha name of the entity accessiories. Wen i load the accessiories compnent the WOToManyRelationship display me the list of Cars that I can choose, correctly. But when I submit the form I obtain an exception. Can anyone help me with this?

Exceptions are important. They provide valuable clues as to what went wrong. Try carefully reading all the details of the exception. Can you spot the problem? If not, post the entire exception with stack trace here and perhaps we can help. Otherwise we are just guessing.
Chuck
-- Practical WebObjects - a book for intermediate WebObjects developers who want to increase their overall knowledge of WebObjects, or those who are trying to solve specific application development problems. http://www.global-village.net/products/practical_webobjects
-- Practical WebObjects - a book for intermediate WebObjects developers who want to increase their overall knowledge of WebObjects, or those who are trying to solve specific application development problems. http://www.global-village.net/products/practical_webobjects
-- Practical WebObjects - a book for intermediate WebObjects developers who want to increase their overall knowledge of WebObjects, or those who are trying to solve specific application development problems. http://www.global-village.net/products/practical_webobjects
-- Practical WebObjects - a book for intermediate WebObjects developers who want to increase their overall knowledge of WebObjects, or those who are trying to solve specific application development problems. http://www.global-village.net/products/practical_webobjects


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Re: WOToManyRelationship trouble
From: Chuck Hill <email@hidden>


References:  
  >WOToManyRelationship trouble (From: Amedeo Mantica <email@hidden>)
  >Re: WOToManyRelationship trouble (From: Chuck Hill <email@hidden>)
  >Re: WOToManyRelationship trouble (From: Chuck Hill <email@hidden>)
  >Re: WOToManyRelationship trouble (From: Chuck Hill <email@hidden>)




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