Objects:
- NSManagedObject *item - some managaged object
- NSArray *attributes - an array of the item's attributes
Desired Result:
- a possibly smaller array of attribites where [item valueForKey:<an
attribute>] != nil.
In code, I can simply iterate over the keys, perform the valueForKey,
and skip nil values. I played around with expressions and predicates to
solve this, to no avail.
I completely understand that the code solution is probably the way to go
- however, I'd be interested to know if a solution using NSArray's
filteredArrayWithPredicate and/or some combination of predicates and
expressions could provide the answer - as an academic exercise.
David
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