迅速-检索objectId字段导致致命错误 [英] swift - retrieve objectId field causes fatal error

问题描述

这是我的代码:

    @IBAction func saveSettings(sender: AnyObject) {
    var settings:PFObject = PFObject(className: "Settings")
    settings["routes"] = routesSetting as String
    settings["sortBy"] = sortBySetting as String
    settings["user"] = PFUser.currentUser()
    settings.saveInBackgroundWithBlock{(success:Bool!, error:NSError!) ->Void in
        if success != nil {
            NSLog("%@","OK-settings data saved")
            NSLog("%@",self.routesSetting as String)
        }
        else
        {
            NSLog("%@",error)
        }
    }
}

@IBAction func updateSettings(sender: AnyObject) {

    var settings:PFObject = PFObject(className:"Settings")
    var id = settings["objectId"] as String
    var query = PFQuery(className:"Settings")

    println(settings)
    println(id)
    println(query)

    query.getObjectInBackgroundWithId(id) {
        (settings: PFObject!, error: NSError!) -> Void in
        if error != nil {
            NSLog("%@", error)
        } else {
            settings["routes"] = self.routesSetting as String
            settings["sortBy"] = self.sortBySetting as String
            settings.save()
        }
    }

我可以毫无问题地运行saveSettings代码.我已将其设置为在新用户注册该应用程序时运行.我已验证新行已插入到解析云数据库中的设置表中.但是我现在想简单地更新单行，而不是每次保存时都创建一个新行.因此，我一直在进行updateSettings函数.我已经按照Parse文档中的说明更新了对象( https://parse.com/docs/ios_guide #objects-updating/iOS ).当我单击更新"按钮以运行该功能时，我得到:

I can run the saveSettings code with no issues. I have set it up to run when a new user signs up with the application. I have verified that a new row is inserted into the settings table in the Parse cloud DB. But I would now like to simply UPDATE the single row instead of create a new row every time there is a save. So I have been working on the updateSettings function. I have followed the Parse documentation for updating objects (https://parse.com/docs/ios_guide#objects-updating/iOS). When I click on the Update button to run the function, I get:

严重错误:解开可选值时意外发现nil (lldb)

fatal error: unexpectedly found nil while unwrapping an Optional value (lldb)

它指向的行是:

var id = settings["objectId"] as String

我是Parse的完整入门者.

I am a complete beginner to Parse.

一些最近的附加信息:

println语句的结果:

The results of the println statements:

<Settings: 0x7fd423805260, 
 objectId: new, localId: (null)> {
}
nil
<PFQuery: 0x7fd4217191f0>

那么问题的一部分就是它不是在检索objectId吗?

So part of the problem is it is not retrieving the objectId?

推荐答案

PFObject具有称为"objectId"的属性，它没有存储在字典中，因此您可以将其作为

PFObject has a property called "objectId", it is not stored in a dictionary, so you can return it as

var id = settings.objectId

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