Non-Optional expression of type used in check for optionals

Question

let rootInfo = realm.objects(StoreRealM.self).filter(msg)
    var root = [StoreRealM]()            
    for i in 0 ..< rootInfo.count {
        if let result = rootInfo[i] as? StoreRealM {
            root.append(result)
        }
    }

if let result = rootInfo[i] as? StoreRealM if let result = rootInfo[i] as? StoreRealM on this line I get it. I also get

Conditional cast from 'StoreRealM' to 'StoreRealM' always succeeds

Answer 1

Since root only can contain StoreRealM objects (guaranteed by the compiler), you do not need to cast the index access to this type; even more, it cannot contain Optional<StoreRealM> objects.

So it should be sufficient to write the for loop:

for i in 0 ..< rootInfo.count {
    let result = rootInfo[i]
    root.append(result)
}