Re: Data Model Design Q: Translation
Re: Data Model Design Q: Translation
- Subject: Re: Data Model Design Q: Translation
- From: "I. Savant" <email@hidden>
- Date: Wed, 12 Jul 2006 16:00:04 -0400
Ben:
Nobody's responded yet so I'll take a stab. If all you're asking
is how to create entities with the relationships you've described in
your ASCII graphic below, then this is very basic and simple with the
data modeler.
If you require a "Coin" of a certain type to match a certain set
of criteria to be allowed to be related to a substitution (or vice-
versa), you will need to implement validation with whatever logic you
choose.
All of how-to's of this can be read here:
http://developer.apple.com/documentation/Cocoa/Conceptual/CoreData/
index.html
For information on how to use the modeler, see XCode's help book.
If I've missed your point, you'll probably need to elaborate.
--
I.S.
On Jul 11, 2006, at 4:38 PM, Ben Lachman wrote:
I'm wondering how to design my data model so that I can include a
substitution/translation object in my model. Basically I want an
object that says 3 of this thing is equal to 4 of that thing, where
the things are of the same class. A basic example would be
substituting change: 5 pennies are equal to 1 nickel, 4 nickels
are equal to 2 dimes, etc. The inverse of these is always true as
well. This makes sense and seems pretty simple, but I can't figure
out a decent way of doing this within the xcode data modeler. What
I'd like is something like this:
[ Coin ] <---->> [ Substitution ] <<----> [ Coin ]
where [ Coin ] has a substitutions to-many relationship and
[ Substitution ] has a pair of amounts (5 and 1 for instance) and
relationships (to the nickel and penny coin objects).
Does anyone have an idea of how to do this in xcode?
Thanks,
->Ben
--
The user's going to pick dancing pigs over security every time. —
Bruce Schneier
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