Re: Getting data from NSOutlineView [solved, kind of...]
Re: Getting data from NSOutlineView [solved, kind of...]
- Subject: Re: Getting data from NSOutlineView [solved, kind of...]
- From: Wain <email@hidden>
- Date: Thu, 15 Dec 2005 18:19:41 +0000
Hi,
Have you considered using fetch requests and predicates to get and
filter the data you want from the persistent store?
http://developer.apple.com/documentation/Cocoa/Reference/
CoreData_ObjC/Classes/NSFetchRequest.html
http://developer.apple.com/documentation/Cocoa/Conceptual/Predicates/
index.html#//apple_ref/doc/uid/TP40001789
Your on the right line using a controller to interrogate the data
store and update your view.
Wain
On 15 Dec 2005, at 13:33, goessly wrote:
Is it possible that there is no way to access the actual data
managed by Core Data, except within the limited possibilities
provided by bindings? After checking several related topics I'm a
at a complete loss here.
I have set up a core data doc based app. I can create custom data
sets, no problem. I've got a sceneGraph-View which is supposed to
render a graphical representation of those items. Therefor I need
to access the properties of the data sets, which are defined based
on a xcdatamodel. Their instances are displayed in an
NSOutlineView, managed by a NSTreecontroller; connected using
bindings. Any design flaws so far, or would you consider this a
valid approach?
Now why is it so hard to access this content from another class,
i.e. my sceneGraph-Controller?
I've tried three different approaches to create such in interface:
via NSTreeController, via NSOutlineView, and by the implementations
of the modeled entity. Accessing it by reading directly from the
Document came to mind, but I had no idea how to do that.
Frustrating, since the task seems so easy: get the following
properties from all currently present instances of my entity.
Am I missing something? Any further readings, suggestions, comments?
Best regards,
goessly
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