Rails：在帖子中订购评论

Question

我希望我的评论按降序显示，但在Post模型中添加：order 并不起作用。

import SpriteKit

class GameScene: SKScene {

    var Center = SKSpriteNode()
    var Player = SKSpriteNode()
    var timer = NSTimer()
    var seconds = 0

    override func didMoveToView(view: SKView) {

        Center = SKSpriteNode(imageNamed: "Center")
        Center.size = CGSize(width: 80, height: 80)
        Center.position = CGPoint(x: CGRectGetMidX(self.frame), y: CGRectGetMidY(self.frame))
        self.addChild(Center)

        Player = SKSpriteNode(imageNamed: "Player")
        Player.size = CGSize(width: 80, height: 80)
        Player.position = CGPoint(x: frame.size.width / 2, y: frame.size.height / 2)
        self.addChild(Player)

    }


    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {

        timer = NSTimer.scheduledTimerWithTimeInterval(4.0, target: self, selector: #selector(GameScene.playerScaleUp), userInfo: nil, repeats: true)

       }

    func playerScaleUp(){
        if seconds > 0{
            Player.runAction(SKAction.scaleBy(4, duration: 2))

        }

    }

    func playerScaleDown(){
        if seconds > 3{
            Player.runAction(SKAction.scaleBy(-4, duration: 2))

        }
    }

    func resetScale(){
        if seconds > 7{
            timer.invalidate()

        }
    }

    override func update(currentTime: CFTimeInterval) {



    }

}

我在 PostsController 的show action上出现了参数错误。用于执行此操作的方法是什么？