JSON array to Realm's List type with ObjectMapper

ListTransform.swift

import Foundation
import ObjectMapper
import RealmSwift

class ListTransform<T:RealmSwift.Object where T:Mappable> : TransformType {
  typealias Object = List<T>
  typealias JSON = [AnyObject]
  
  let mapper = Mapper<T>()
  
  func transformFromJSON(value: AnyObject?) -> Object? {
    var results = List<T>()
    if let value = value as? [AnyObject] {
      for json in value {
        if let obj = mapper.map(json) {
          results.append(obj)
        }
      }
    }
    return results
  }
  
  func transformToJSON(value: Object?) -> JSON? {
    var results = [AnyObject]()
    if let value = value {
      for obj in value {
        let json = mapper.toJSON(obj)
        results.append(json)
      }
    }
    return results
  }
}