解析Swift中的objectID

Question

我正试图从解析加载一页关于Swift对象的信息。给出的代码允许您一次检索整个类。但如何在不访问Parse上的仪表板的情况下检索ObjectID呢?

这段代码来自Parse

    var query = PFQuery(className:"GameScore")
query.getObjectInBackgroundWithId("xWMyZEGZ") {
  (gameScore: PFObject?, error: NSError?) -> Void in
  if error == nil && gameScore != nil {
    println(gameScore)
  } else {
    println(error)
  }
}

一切都是直截了当的，但我仍然不知道如何获得随机生成的ObjectID

Answer 1

如果我正确理解你的问题，你想查询所有对象并列出其id，例如:

var query = PFQuery(className:"GameScore")
    query.findObjectsInBackgroundWithBlock {
        (objects: [AnyObject]!, error: NSError!) -> Void in
        if error == nil {
            println("Successfully retrieved (objects.count) scores.")
            //list of Ids
            for object in objects {
                objectIds.append(object.objectId as String)
            }
        } else {
            println("(error)")
        }
    }

Answer 2

做到这一点的最好方法是在解析仪表板中有两个单独的类。根据你的例子，一个是carTypes，另一个是carDetails类，带有指向carTypes的指针。

当你点击一辆汽车时，你可以使用来自carTypes的objectId来查询carDetails类。

例如

    // you have to give this object some value when you click on a button or    cell..etc
    var selectedCar : PFObject?
//in the query i didn't use selectedCar.objectId because i am using pointers to the carType class so parse will get the objectId for you
        let query = PFQuery(className: "carDetails")
        query.whereKey("carType", equalTo: selectedCar)
        query.findObjectsInBackgroundWithBlock({ (object: [PFObject]?,error: NSError?) -> Void in
                    if error == nil {
        some code here
        }
                    })