On Mar 8, 2009, at 10:14, Michael Süssner wrote:
I have started to experiment with the core data framework and have
run immediately into a problem.
I have modelled a data entity "Person" and setup a window in IB
which displays all parameters of a single data record. Then I have
added a button which calls the add: method of the PersonController
Object, IB has created.
When I execute the program and click on the add button, the
controller creates a new data record and I can enter the attributes.
If I press again the button, the add method is called, but no new
record is created.
I have subclassed the controller object and learned that the canAdd:
method returns false after I press the button the second time.
What have I done wrong? Which action does the controller expect?
If you're trying to create multiple Persons, you should be using a
NSArrayController, not a NSObjectController.
The documentation sort of explains the behavior you're seeing for
NSObjectController:
http://developer.apple.com/documentation/Cocoa/Conceptual/CocoaBindings/Concepts/CntrlContent.html#/
/apple_ref/doc/uid/TP40002147-183285-BBCDFJHD
(in the second paragraph)._______________________________________________
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