Re: Core Data problems
Re: Core Data problems
- Subject: Re: Core Data problems
- From: "Kyle Sluder" <email@hidden>
- Date: Thu, 21 Feb 2008 14:19:51 -0500
On Thu, Feb 21, 2008 at 2:14 PM, John Gustafsson
<email@hidden> wrote:
> I have kind of a newbie question that I was hoping someone could help
> me with. I'm trying to learn Cocoa/Core Data coming from a different
> background and I got some help from a friend but we have struck out
> and can't figure out what to do next. The idea is very simple. I want
> an array of arrays of cards. The first list should list series (for
> example common kanji, mayan temples, cocoa coding heroes, etc) and the
> second list individual cards. Having selected a card you should be
> able to edit the front and back of that card.
OK, so you seem to be having a data modeling issue. First, abandon
the concept of arrays; Core Data doesn't use them, and you're really
talking about set theory, so we'll talk about sets.
So you want to have a set A of subjects. You also want a mapping F
from a subject to a set of what sound to me like flashcards. Elements
of set A are of type Subject, elements of set F(A) are of type
Flashcard. A Subject has a title, and a Flashcard has a front side
and a back side.
>From here, it should be very clear how you would model this in the
Core Data model designer.
HTH,
--Kyle Sluder
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