Preventing Undo Registration when inserting into the MOC (managed object context)
Preventing Undo Registration when inserting into the MOC (managed object context)
- Subject: Preventing Undo Registration when inserting into the MOC (managed object context)
- From: email@hidden
- Date: Thu, 2 Mar 2006 13:42:19 -0800
Hi list.
Currently, I have a value that is created passively, only when called
in valueForKey.
This value is taken from a managed object that is created to supply
the value.
And this value is only requested after being inserted into an array
controller (its returning a value displayed in a table column).
I though disabling undo registration would fix this, but it doesn't
because I get a "shadow" undo after insertion into the moc.
Also, creating an undo group wont work because after inserting an
object into the array controller, the runloop finishes its current
event, so by the time my "shadow" object is inserted, its too late to
group it into the same undo group (IOW, making an undo group in -
add: method of NSArrayController doesn't work).
Here is what I'm observing:
NSRunloop (begin event)
- array controller add:
NSRunloop (end event)
NSRunloop (begin event)
- table column -setNeedsDisplay:
- myItem -valueForKey:
- managed object context -insertObject: (HERE TURNING OF UNDO
RESTORATION DOES NOT WORK APPARENTLY)
- myItem (return value)
NSRunloop (end event)
So, then clicking undo only un-does the last event (NSManagedObject
_undoInsertions:)
How can I let the object context insert an object but have it not
register it in the undo stack? (The inserted object deletes itself
upon save it its "empty" anyways so its OK to have it "invisible")
Thanks in advance!
Andre
email@hidden
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