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how do i filter children with NSTreeController/NSOutlineView/Core Data

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how do i filter children with NSTreeController/NSOutlineView/Core Data

Subject: how do i filter children with NSTreeController/NSOutlineView/Core Data
From: Ken Victor <email@hidden>
Date: Tue, 6 Jun 2006 15:58:46 -0700

one of my core data model entities is actually a tree; ie, each entity has a one to many relationship (parent->>children) and the child enitity has a one to one relationship (child->parent). both child and parent are the same type of entity.

using an NSOutlineView bound to a NSTreeController i can get my outline view to display properly by setting a filter predicate of "parent==nil" in IB. i can even successfully filter the top level objects by adjusting the filter predicate in IB.

but how can i filter the children? eg, consider that this entity has an attribute that can have the value of 1, 2, or 3. any parent (ie, a parent with a value of 1, 2, or 3) can have children with all values. i'd like to be able to filter the results to show only parents and children with one value (eg., 2).

can this be done? if so, how? or could someone point me to some example or documentation that explains how to do this?

thanx,
ken

ps. i've done the requisite searches in the list archives and didn't find any solution (or my search query was wrong) _______________________________________________ Do not post admin requests to the list. They will be ignored. Cocoa-dev mailing list (email@hidden) Help/Unsubscribe/Update your Subscription: This email sent to email@hidden Prev by Date: Re: changing executable name of cocoa app Next by Date: Re: how do i filter children with NSTreeController/NSOutlineView/Core Data Previous by thread: Re: changing executable name of cocoa app Next by thread: Re: how do i filter children with NSTreeController/NSOutlineView/Core Data Index(es): Date Thread