Swift - Predicate to filter an array by a property of member array
<p>I need to filter out an array of MyClass3 Objects. An array of MyClass2 Objects is a member of MyClass3 object(Please refer to code below). MyClass2 object has an id. I have an idArray at hand. I need to filter out those MyClass3 objects in which all ids in idArray are present in its [MyClass2] member.</p>

<pre><code>class MyClass2 : NSObject {
    var uid: Int = 0

    init(uid : Int) {
        self.uid = uid
    }
}

class MyClass3 : NSObject {
    var arr: [MyClass2]

    init(units: [MyClass2]) {
        arr = units
    }
}

var units1 = [MyClass2(uid: 1),MyClass2(uid: 2), MyClass2(uid: 3), MyClass2(uid: 4), MyClass2(uid: 5)]
var units2 = [MyClass2(uid: 4),MyClass2(uid: 5), MyClass2(uid: 6)]
var units3 = [MyClass2(uid: 3),MyClass2(uid: 5), MyClass2(uid: 7), MyClass2(uid: 1)]

var ids = [1,5]

var available3: [MyClass3] = [MyClass3(units: units1), MyClass3(units: units2), MyClass3(units: units3)]
var filtered3: [MyClass3] = []

let searchPredicate: NSPredicate = NSPredicate(format: " ANY arr.uid IN \(ids)") // needed predicate
print(searchPredicate.predicateFormat)
filtered3 = (available3 as NSArray).filteredArrayUsingPredicate(searchPredicate) as! [MyClass3]
</code></pre>

<p>The required answer is that we need MyClass3(units: units1) and MyClass3(units: units3) in the filtered Array.</p>

<p>This is not working out. Can someone suggest a predicate format for this purpose</p>