在Swift中将PFObject(Parse)转换为JSON? [英] Converting PFObject (Parse) into JSON in Swift?

问题描述

有没有一种方法可以将PFObject从Parse转换为JSON?我另存为JSON，但是当我尝试加载时，我又得到了[AnyObject].强制转换为JSON无效:

Is there a way to convert a PFObject from Parse into JSON? I saved as JSON, but when I try to load I'm getting [AnyObject] back. Casting to JSON won't work:

class func loadPeople() -> [String : Person] {

        var peopleDictionary: [String : Person] = [:]

        let query = PFQuery(className: "userPeeps")

        query.findObjectsInBackgroundWithBlock { (objects, error) -> Void in
        if error == nil {


            //this only returns the first entry, how do I get them all?

            if let peopleFromParse = objects?.first?.objectForKey("userPeeps") as? JSON {
                for name in peopleFromParse.keys {
                    if let personJSON = peopleFromParse[name] as? JSON,

                        let person = Person(json: personJSON) {
                            peopleDictionary[name] = person
                    }
                }
            }

下面是我的保存功能，该功能可以将JSON像我想要的那样保存到Parse中:

below is my save function, which works and saves the JSON into Parse like I want:

class DataManager {

    typealias JSON = [String: AnyObject]

    class func savePeople(people: [String : Person]) {

        var peopleDictionary = people

        var peopleJSON: JSON = [:]

        for name in peopleDictionary.keys {
            peopleJSON[name] = peopleDictionary[name]!.toJSON()
        }

        let userPeeps = PFObject(className: "userPeeps")

          userPeeps.setObject(peopleJSON, forKey: "userPeeps")

        userPeeps.saveInBackgroundWithBlock { (succeeded, error) -> Void in
                        if succeeded {
                            println("Object Uploaded")
                        } else {
                            println("Error: \(error) \(error!.userInfo!)")
                        }
                    }

    }

推荐答案

因此，答案(如Paulw11所指出的)是，对象"是实际数据的包装，因此有必要遍历数组并将每个值存储为JSON:

So the answer (as Paulw11 points out above) is that "objects" is sort of a wrapper for the real data, so it was necessary to iterate through the array and store each value as JSON:

var peopleDictionary: [String : Person] = [:]

        //1 load the dictionary of JSON for key people from Parse
        let query = PFQuery(className: "userPeeps")

        query.findObjectsInBackgroundWithBlock { (objects, error) -> Void in
            if error == nil {

                if let unwrappedObjects = objects {

                    for object in unwrappedObjects {

                        if let peopleFromParse = object as? JSON {

                            for name in peopleFromParse.keys {
                                if let personJSON = peopleFromParse[name] as? JSON,

                                    let person = Person(json: personJSON) {
                                        peopleDictionary[name] = person
                                }
                            }
                        }
                    }
                }

这篇关于在Swift中将PFObject(Parse)转换为JSON?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！