Re: Core Data: Master-Detail question
Re: Core Data: Master-Detail question
- Subject: Re: Core Data: Master-Detail question
- From: Matt Ronge <email@hidden>
- Date: Thu, 22 Dec 2005 16:20:57 -0600
Frederick C. Lee wrote:
Greetings:
I'm trying to construct a master-detail binding using
NSArrayControllers. I'll use the 'Core Recipe' paradigm here.
I want to be able to display a NSPopupButton (Recipe) that is the
master entity controlling the table of ingredients.
The elements of the NSTableView are dependent on the NSPopupButton.
Scenario:
Entities (NSManagedObjects):
Recipe : Ingredients (1:many).
Question: How do I link the Recipe with its associated Ingredients
per Entity-Relationship diagram so that only the ingredients are
displayed per recipe?
In short, how do I make the Ingredient Controller dependent on the
Recipe Controller?
What you want to do is attach your ingredients controller to your recipe
controller using bindings. So in the ingredients controller setup a
contentSet binding that is attached to recipe with selection, do NOT use
arrangedObjects. When the selection is changed in the popup the
selection will be changed in the recipe controller and it's
corresponding ingredients will change. If you just have the
managedObjectContext binding setup and no contentSet with selection
binding setup, it will pull all of the ingredients from that database
which is what I assume is happening now.
Hope that helps
--
Matt Ronge
http://www.theronge.com
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