How to make universal GET method for Realm objects?

Question

I my viewControllers I often use realm.objects(className.self) to download data from className table. I wanted to simplify that so I created another swift file with get method.
It looks like this:

class Realm_manager {
    private init() {}
    static let shared = Realm_manager()

    let realm = try! Realm()
    func getObjects() -> [customType]{
            let result = realm.objects(customType.self)
            return Array(result)
        } 
}

But that getObjects method works only for customType objects. With this in viewController it works fine:

    let result = Realm_manager.shared.getObjects()
    for item in result {
            myArray.append(item)
        }
    //this works because myArray is of type customType.

I want to make getObjects universal method which can accept any class.

Answer 1

Use Generics

class RealmManager {
    private init() {}
    static let shared = RealmManager()

    let realm = try! Realm()

    func getObjects<T: Object>() -> [T] {
        let result = realm.objects(T.self)
        return Array(result)
    } 
}

usage:

let manager = RealmManager.shared
let dogs: [Dogs] = manager.getObjects()

Note: In Swift we generally do not use underscores in Type names, they are normally upper camel cased. Realm_manager -> RealmManager