Handy PFObject extensions

PFObjectExtensions.swift

//
//  PFObjectExtensions.swift
//  Only Indie Coffee
//
//  Created by Damien Bell on 5/30/16.
//  Copyright © 2016 Damien Bell. All rights reserved.
//

import Foundation
import Parse

extension PFObject {

    /* Because PFObject is a subclasss of NSObject, to PFObject usefully hashable we need to override the isEqual method
       Note: not all pfObjects will have objectId's, this one is an example that 
       worked in my case.
       
       You will still need to override the hashValue getter in your pfObject subclass.
       You can define the commented code below in this file if it fits your usecase.
       Otherwise, define that method on your PFObject subclass in a manner which always 
       provides a unique object.
       
      override public var hashValue : Int {
        get {
            if let id = self.objectId{
                return id.hashValue
            }else{
                return 0
            }
        }
    }
    
    */
    public override func isEqual(object: AnyObject?) -> Bool {
        
        if (object as? PFObject)?.objectId == self.objectId {
            return true
        } else {
            return super.isEqual(object)
        }
    }
}