Re: Duplicate rows appearing in outlineview after creating new Entity in moc, why?

[Jonathan Dann]

Yeah come to think of it I saw this behaviour when adopting the mediator pattern in my app. In the NSPersistentDoc tutorial you can create a Dept. object just using NSObjectController, then bind your array contorller's contentSet binding to the object controller's dept.employees keypath (or whatever they recommend). I tried to do the same but with NSTreeController and had the same problems.

Jon

On 17 Jul 2008, at 00:34, Sean McBride wrote:

I'd file a bug if I were you. I now populate my tree controller by binding it only to the MOC, and the problem disappears. So even though I have my Dept. object, which has a bunch of employees in a to many relationship I still fetch the tree data direct from the context. This approach may not work for what you describe as the tree you view seems to depend on another selection.

Jon,



I have narrowed this down to the fact that my treecontroller has its
'contentSet' binding set.  If I remove that binding, duplicates no
longer appear.

I have created a very simple test app to illustrate:
<http://www.rogue-research.com/vtk/TreeTest.zip>

It's a master-detail interface.  The master is a tableview/

on the right.  The treecontroller's 'contentSet' binding is bound to
'arrayController.selection.someRelationship'.

If someone would care to try:
- launch the app
- click 'Add Family'
- click 'New Folder'
- expand the folder's disclosure triangle
- (keep the folder selected)
- click 'New Person'

The new person appears both in the folder and at the root of the
outlineview.  Remove the contentSet binding and the problem goes away.
It's only 50 lines of code.  I don't get it.

Cheers,

Sean


On 7/16/08 1:44 PM, Jonathan Dann said:

Thanks for your reply. My fetch predicate was already "parent == nil". arraycontroller on the left, the detail is an outlineview/ treecontroller

The duplicate problem is likely fixed by giving the tee controller a
fetch predicate in IB. Set the predicate to something like
parent==nil. This will obviously depend on what you've called your
'parent' property.


core data apps.

http://espresso-served-here.com

HTH

Jon

On 15 Jul 2008, at 22:59, "Sean McBride" <[EMAIL PROTECTED]>
wrote:

I've blogged about doing this with drag and drop in core data and non-

Hi all,

I have an outlineview populated by binding to a treecontroller.  It
displays CoreData entities of type "Person".  "Person" has 'parent'
and
'children' relationships.  Displaying everything works fine.

Now the outlineview must support drops.  In my windowcontroller, I
implement outlineView:acceptDrop:item:childIndex: and look for my
custom
pasteboard type.  If it's there, I need to create a new "Person"
entity.  How should I do this?

I have tried:
a) [myTreeController add:nil];

b) Person* person = [myTreeController newObject];
  [person setParent:...];

c) Person* person = [NSEntityDescription
    insertNewObjectForEntityForName:@"Person"
    inManagedObjectContext:moc];
  [person setParent:...];

In all cases, the outlineview shows 2 of the new person.  The
problem is

new person is there.

Thanks,

--
____________________________________________________________
Sean McBride, B. Eng                 [EMAIL PROTECTED]
Rogue Research                        www.rogue-research.com
Mac Software Developer              Montréal, Québec, Canada


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