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CoreData and NSObjectController

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CoreData and NSObjectController

Subject: CoreData and NSObjectController
From: Michael Süssner <email@hidden>
Date: Sun, 8 Mar 2009 18:14:09 +0100

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?

Any suggestions?
Michael

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