Hi Timo, > a) Is it really THAT complicated to create an instance of MyEntity and set > the attribute? I'm coming from the Rails/ActiveRecord world where this could > easily be done with a single line of code (including saving the instantiated > object): MyEntity.new(:attribute1 => "Test").save ) > > b) How can I save this fresh instance and update my NSTableView?
After you have modeled your entity in the Xcode core data modeling view, you
can use
instance = NSEntityDescription.insertNewObjectForEntityForName(
"MyEntity", inManagedObjectContext:managedObjectContext
)
to instantiate an instance. You can save it calling
error = Pointer.new_with_type("@")
managedObjectContext.save(error)
To save attributes, simply assign to them:
instance.attribute1 = 'Test'
This assumes you've added that attribute to your model. The
managedObjectContext can be created or, if you're using a core data project
like the document one, you'll have a managedObjectContext accessible from your
NSDocument subclass: self. managedObjectContext
If you have bound your NSTableView to the model object, changes will be picked
up automatically. You'll only need to call save to actually persist to disk.
I hope this helps somewhat, there's much more detail to it and the following
links explain more of those:
http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/CoreData/cdProgrammingGuide.html
and some MacRuby specific ones that I've found useful in the past
http://www.springenwerk.com/2008/10/macruby-and-core-data-tutorial.html
http://cyberfox.com/blog/120-how-i-learned-to-stop-worrying-about-core-data-and-love-macruby
http://reborg.tumblr.com/post/263347770/macruby-coredata-tutorial
Cheers,
Sven
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