On Sep 30, 2009, at 16:22:45, Rick Mann wrote:
I'm looking at ways of grouping some Core Data objects in a outline
view. What I have are 3 or 4 different entities, and I want each of
the objects of each type to appear under a parent item in the
outline view.
Currently, I've implemented a simple table view and it's bound to an
array controller that gets the objects from Core Data. Now I want to
expand that same list to handle the other objects, so an outline
view seems natural, with the top level nodes corresponding to the
various types of entities, and the entities existing below.
Since the model doesn't have any notion of groups, I'd like to
programmatically create the top entities, and have core data manage
the children of each. Is this even possible?
Do you think I could create an plain Obj-C object with appropriate
accessors to act as my grouping object, and then have it implement
Core Data fetch operations to return the children? I don't know,
though, how to get changes in the managed object context to be
automatically reflected in the tree view using this technique. I'm
sure there's some observer/key notification thing to set up, but I'm
not very fluent in the programmatic aspects of that stuff.
--
Rick
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