iosgenericsswiftnsorderedset

How to covert NSMutableOrderedSet to generic array?

I have this for loop, p is a NSManagedObject, fathers is a to-many relationship, so I need to cast NSMutableOrderedSet to [Family] but it does not work, why? 

for f in p.fathers as [Family] {
}

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Solution

  • You can obtain an array representation of the set via the array property - then you can downcast it to the proper type and assign to a variable:

    let families = p.fathers.array as [Family]

    but of course you can also use it directly in the loop:

    for f in p.fathers.array as [Family] {
    ....
}

    Update

    A forced downcast is now required using the ! operator, so the code above should be:

    let families = p.fathers.array as! [Family]