ios - 使用 Parse 更新高分条目

Question

下面是保存用户高分以供解析的代码段。它工作得很好，除了为用户创建一个新条目而不是更新用户当前高分的部分之外，这意味着如果约翰超过自己的分数 10 次，我可以有 10 个“john doe”条目。我怎样才能做到这一点，以便解析首先检查用户是否具有高分并更新它，并且仅在用户当前没有高分条目时才创建一个新条目。

// Save Highscore to parse using swift.

        let gameScore = PFObject(className:"HighScore")
        gameScore.setObject(currentScore, forKey: "highScore")
        if let _ = PFUser.currentUser()?.username {
            gameScore.setObject((PFUser.currentUser()?["name"])!, forKey: "player")
            gameScore.setObject(currentScore, forKey: "highScore")
            //gameScore.setObject((PFUser.currentUser()?["image"])!, forKey: "PlayerImage")
            gameScore.saveInBackgroundWithBlock {
                (success: Bool, error: NSError?) -> Void in
                if (success) {
                    // The object has been saved.
                    print("High Score saved to Parse")
                } else {
                    // There was a problem, check error.description
                    print("Error in saving High Score to Parse.")
                }
            }
        }

Answer 1

我在解析文档中找到了示例解决方案。

var query = PFQuery(className:"GameScore")
query.getObjectInBackgroundWithId("xWMyZEGZ") {
  (gameScore: PFObject?, error: NSError?) -> Void in
  if error != nil {
    print(error)
  } else if let gameScore = gameScore {
    gameScore["cheatMode"] = true
    gameScore["score"] = 1338
    gameScore.saveInBackground()
  }
}

Updating Objects