Filtering entries from a Core Data entity that appear in an NSPopUpButton list

Question

I'm familiar with how to feed data from one Core Data entity into an NSPopUpButton item so that it can be selected for another. Bindings like so:

For the values themselves:

-> ValueSelection.Content
    Bind To: Value Source Entity
    Controller Key: arrangedObjects
    Model Key: N/A

For the values displayed in the NSPopUpButton:

-> ValueSelection.ContentValues
    Bind to: Same entity as ValueSelection.Content
    Controller Key: arrangedObjects
    Model Key: the name of the attribute you wish to have displayed

To link it to the destination value:

-> ValueSelection.SelectedObject
    Bind to: Destination entity
    Controller Key: selection
    Model Key: Name of the attribute/relationship in the destination entity.

What I'm trying to do is figure out if there is a way to set up a filter (I'm guessing in ContentValues) where you can only have it grab entries from that entity that have a certain attribute flag checked (e.g. say I'm pulling from my users entity and I just wanted to list male or female users).

Answer 1

NSArrayController has a "filter predicate", which can be set in Interface Builder or in code (via the method in the docs to which I linked). See the Predicates Programming Guide to figure out what predicate you'll need to supply for your desired filter.