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Core Data Binding with NSArrayController: Replace NSArrayController w/in IB breaks the application

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Core Data Binding with NSArrayController: Replace NSArrayController w/in IB breaks the application

Subject: Core Data Binding with NSArrayController: Replace NSArrayController w/in IB breaks the application
From: "Frederick C. Lee" <email@hidden>
Date: Wed, 19 Oct 2005 13:22:22 -0700

Greetings: I'm toying with a simple Core Data + Binding example supplied by Apple: Core Recipes ("Working with Core Data and Cocoa Bindings").

Scenario:

1) Data Diagram: Chef --> Recipe --> Ingredient (1:many...) 1a) The Recipe and Ingredient tables have their respective NSArrayController.

2) I replaced an original NSArrayController via IB ('Ingredient' array controller - child of recipe) with the SAME NSArrayController icon from the IB Palette; and set the attribute/bindings accordingly - per original setup. <-- I wanted to break/repair the code.

4) Re-build and ran: the NSArrayController no-longer works.

Clues: a) The program complains when I misspelled a key-value link or merely turned off the binding. <-- obvious. b) But if I delete the controller from IB and recreate it afresh, with the SAME attribute/binding connections; it still doesn't function. Why?? c) Replacing the entire NIB with a backup restores full functionality. <-- The only remedy.

My simple question: Is it possible to merely replace a NSArrayController and the parameter values, etc. (e.g., replace an original with its duplicate), purely within the Interface Builder and have it perform as expected? How do I fix this without having to reload a backup NIB?

My goal is to be able to add functionality to an existing code via IB by adding controllers and adjusting the attribute/bindings accordingly. It's my 'learning process'.

Regards,

Ric.
Bindings Neophyte
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