Re: Core Data : where are the docs ?
Re: Core Data : where are the docs ?
- Subject: Re: Core Data : where are the docs ?
- From: Eric Morand <email@hidden>
- Date: Sun, 4 Sep 2005 12:07:35 +0200
Thanks !
I've been reaéding the docs all night long and have come to the
conclusion that :
- My app IS a document-based one even though I didn't understand at
all what a document was at first.
- I should have understood by myself that Andre was talking about
NSPersistentDocument.
Thanks for your help and advices. I have a lot of personal work to do
before starting using Core Data (and replace my own SQLite wrapper)
but that looks worse the pain.
Eric.
On Sep 3, 2005, at 4:34 PM, Eric Morand wrote:
My app is not a document based app. Or is it ?
Seriously, if you don't know whether your application is document-
based or not, then you should probably not yet be using Core Data.
You need to understand more about Cocoa application architecture in
general first.
I'm pretty sure I've missed a critical documentation that explains
what to do with this file, how to associate it with a
NSManagedObjectModel instance of my app.
A model is a project resource. If you create an application using
one of the Core Data templates, then it's loaded for you -- either
because NSPersistentDocument loads it for you automatically
(<http://developer.apple.com/documentation/Cocoa/Reference/
ApplicationKit/ObjC_classic/Classes/NSPersistentDocument.html#//
apple_ref/doc/uid/TP30001179-CJBJBIHA>) or because the code is
written for you in the template (see the first few lines of
DeleteAppDelegate.m):
#import "DeleteAppDelegate.h"
@implementation DeleteAppDelegate
- (NSManagedObjectModel *)managedObjectModel {
// ...
Worse, I don't know how to fetch from the NSManagedObjectContext
since it is only accessible from my app delegate and not from my
other window controllers (I have a lot of them) ! Should I add a
reference to it on every controller I had to my app ? I sure hope
no...
This is not a Core Data problem, this is a general application
architecture problem. See again the first suggestion...
But yes, if you want to fetch using a specific context, you need a
reference to it. In the same way you would if you had any global
data in an application...
Ih, and last question (once more, I've not found anything about it
in the docs I've read) : what are the differences between the
persistent storage types (SQL, XML...) and which one should I use
in which case ?
<http://developer.apple.com/macosx/coredata.html>
Sorry for the flood, I forgot to ask about this : what is
NSManagedDocument ? I can't find it in Xcode Documentation ?
There is no such thing -- there is NSPersistentDocument.
mmalc
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