JSONToEntityMapable.swift

public protocol JSONToEntityMapable {
   static var map:[String:String] {get} //[entityKey : jsonKey]
   static var relatedByAttribute:String {get} // entityKey which defines the uniqueness of object
   static var relatedJsonKey:String {get} // jsonKey which defines the uniqueness of object
}

extension JSONToEntityMapable {
   static var map:[String:String] {
      return [:]
   }
   static var relatedByAttribute:String {
      return ""
   }
   static var relatedJsonKey:String {
      return ""
   }
}

extension NSManagedObject:JSONToEntityMapable {
}