• Open Menu Close Menu
  • Apple
  • Shopping Bag
  • Apple
  • Mac
  • iPad
  • iPhone
  • Watch
  • TV
  • Music
  • Support
  • Search apple.com
  • Shopping Bag

Lists

Open Menu Close Menu
  • Terms and Conditions
  • Lists hosted on this site
  • Email the Postmaster
  • Tips for posting to public mailing lists
Re: Deletion Confusion
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Deletion Confusion


  • Subject: Re: Deletion Confusion
  • From: George Domurot <email@hidden>
  • Date: Sat, 8 Jan 2005 09:53:09 -0800

You might want to try:

	while(project.phases().count()>0)
		ec.deleteObject(project.phases().objectAtIndex(0));

Your delete rules should take care of the Tasks and any other references.

On Jan 8, 2005, at 8:27 AM, James Cicenia wrote:

Thanks.. I was tooo tired last night. Fresh today!

Thanks for the enlightenment. Temporarily meant:
 in its current EditingContext so I can undo it for them.

I will experiment with: project.setPhases(new NSMutableArray());

Otherwise this seemed to work:

for(int i=0;i<project.phases().count();i++){
ProjectPhase originalPhase = (ProjectPhase)project.phases().objectAtIndex(i);
for(int j=0;j<originalPhase.tasks().count();j++){
ProjectPhaseTask originalTask = (ProjectPhaseTask) originalPhase.tasks().objectAtIndex(j);
ec.deleteObject(originalTask);
}
ec.deleteObject(originalPhase);
}


Maybe I just need to loop through phases as my owns destination and cascade rules are all set properly.

OK - I forgot about not modifying a collection. Hmm, so why did the above code work? Shouldn't project.phases().count()
decrease in value by one each time through?


- James



On Jan 7, 2005, at 8:30 PM, Chuck Hill wrote:


On Jan 7, 2005, at 1:55 PM, James Cicenia wrote:

Hello -

I am baffled, tired, or both.

Baffled usually follows tired pretty closely IME.


I have the following structure with the shown relationships:

Project -->> Phases -->>Tasks

I need to temporarily purge all Phases and Task.

Your use of the word 'temporarily' makes me uneasy. How do you temporarily delete objects? Have you discovered object reincarnation? :-P


Is there a simple one line that I am missing that will do this?

 ec.deleteObject(project);

Which I suspect is not what you want to do.


Do I have to walk through both Phases and Tasks or is
Phases good enough because of the cascade rule?

Phases is good enough. If the Project ->> Phases relationship is set to owns destination, then
project.setPhases(new NSMutableArray());
might do it in one line. I don't know if that will work, seems like it should.



ALSO, when I was iterating over the relationship to delete
each object, the set total kept getting smaller so it would never
delete all the records. It would always leave two. I thought enumerator
would solve that, but no go.


No. You can't modify a collection that you are enumerating. You need to make a copy:
NSArray copyOfPhases = new NSArray(project.phases());
and enumerate that.



Any help would be great.. too tired to see what I am doing wrong here.

Hope that helped.

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





_______________________________________________
Do not post admin requests to the list. They will be ignored.
Webobjects-dev mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
email@hidden


This email sent to email@hidden

_______________________________________________ Do not post admin requests to the list. They will be ignored. Webobjects-dev mailing list (email@hidden) Help/Unsubscribe/Update your Subscription: This email sent to email@hidden
References: 
 >Deletion Confusion (From: James Cicenia <email@hidden>)
 >Re: Deletion Confusion (From: Chuck Hill <email@hidden>)
 >Re: Deletion Confusion (From: James Cicenia <email@hidden>)

  • Prev by Date: Re: Deletion Confusion
  • Next by Date: WODisplayGroup trouble
  • Previous by thread: Re: Deletion Confusion
  • Next by thread: Re: Deletion Confusion
  • Index(es):
    • Date
    • Thread