realm_storage_context_extention03.swift

extension RealmStorageContext {
    func fetch<T: Storable>(_ model: T.Type, predicate: NSPredicate? = nil, sorted: Sorted? = nil, completion: (([T]) -> ())) {
        var objects = self.realm?.objects(model as! Object.Type)
        
        if let predicate = predicate {
            objects = objects?.filter(predicate)
        }
        
        if let sorted = sorted {
            objects = objects?.sorted(byKeyPath: sorted.key, ascending: sorted.ascending)
        }
        
        completion(objects.flatMap { $0 as? T })
    }
}