如何从PFObject中的PFUser（指针）提取字符串/图像属性？

Question

我正在尝试传播一个PFObject，其中包含指向 PFUser（“所有者”）的指针 ：

这是我的提取代码：

public func collectHashTags(#sender:UIViewController, withinGeoCoordinate geoPoint:PFGeoPoint) {
    var query = PFQuery(className:"Tag")
    query.includeKey("owner")  //...note: this doesn't give me the owner object.

    //    query.whereKey("lastGeo", nearGeoPoint:geoPoint, withinKilometers:2)

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), {

        let tagArray = query.findObjects() as [PFObject]
        if tagArray.count > 0 {
            for x in 0...(tagArray.count - 1) {
                disseminateTags(tag:tagArray[x])   // ...load global Tag Array.
            }
        } else {
            showAlert(sender, withTitle:"No Data", withMessage:"The HashTag file is empty.")
        }

    });

}

下面是“标签”，它是一个PFObject，具有我想要获取的数据：

private func disseminateTags(#tag:PFObject) {

    let owner:PFUser = tag[gParseOwner] as PFUser

    let parseID = tag.objectId as String
    let displayName = tag[gParseDisplayName] as String
    let description = tag[gParseDescription] as String
    let radius = tag[gParseRadius] as CGFloat
    let tagPublicFlag = tag[gParsePublic] as Bool
    let startTime = tag[gParseStartTime] as NSDate
    let endTime = tag[gParseEndTime] as NSDate
    let media = tag[gParseMedia]? as [Int]

    let startTimeString:String = startTime.toString()
    let endTimeString:String = endTime.toString()

    // Create the local hashTag object:
    let myTag = hashTag(parseID: parseID, name: displayName, havingDescription: description, owner: owner)
    myTag.radius = radius
    myTag.publicFlag = tagPublicFlag
    myTag.startTimeStamp = startTimeString
    myTag.endTimeStamp = endTimeString

    gTagArray.append(myTag)

}

如您所见，“标签”具有数据。 我想传播PFUser对象“所有者”：

(lldb) po tag
<Tag: 0x7fac1f91c950, objectId: 5J1dNXUdaM, localId: (null)> {
    Media =     (
        3,
        2,
        1
    );
    accessPemission = 1;
    description = "Hashbrown Potatoes";
    displayName = Smirf123;
    endTime = "2104-12-17 20:20:00 +0000";
    geoPoint = "<PFGeoPoint: 0x7fac1f99a990, latitude: 40.000000, longitude: -30.000000>";
    owner = "<PFUser: 0x7fac1f993370, objectId: hk7zYRK4xB>";
    public = 1;
    radius = 2000;
    startTime = "2104-12-15 20:20:00 +0000";
}

但是我遇到了一个问题。 显然我得到了“所有者”（ 注意其 objectID，请参见上文），但在调试器中看不到它：

---

第二次尝试：

使用'includeKey（“ owner”）并没有帮助我。 因此，我对其进行了注释，因此“所有者”属性与“兄弟”类的同级兄弟一起包括在内。

然后，我尝试在所有者 （id）字段上进行查询 （参考： https : //www.parse.com/docs/ios_guide#queries/iOS ）：

 public func collectHashTags(#sender:UIViewController, withinGeoCoordinate geoPoint:PFGeoPoint) { var query = PFQuery(className:"Tag") // query.includeKey("owner") // query.whereKey("lastGeo", nearGeoPoint:geoPoint, withinKilometers:2) dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), { let tagArray = query.findObjects() as [PFObject] if tagArray.count > 0 { for x in 0...(tagArray.count - 1) { disseminateTags(tag:tagArray[x]) // ...load global Tag Array. } } else { showAlert(sender, withTitle:"No Data", withMessage:"The HashTag file is empty.") } }); } 

 private func disseminateTags(#tag:PFObject) { let owner = tag[gParseOwner] as PFUser owner.fetchIfNeededInBackgroundWithBlock { (object: PFObject!, error: NSError!) -> Void in if error != nil { println("Error: \\(error)") } else { println("Fetched Owner: \\(object)") } } } 

这次NSError标记了以下内容：

 ...Error: object not found for get (Code: 101, Version: 1.5.0) ...Error: object not found for get (Code: 101, Version: 1.5.0) ...Error: object not found for get (Code: 101, Version: 1.5.0) ...Error: object not found for get (Code: 101, Version: 1.5.0) Error: Error Domain=Parse Code=101 "The operation couldn't be completed. (Parse error 101.)" UserInfo=0x7ff9d260af40 {error=object not found for get, code=101} Error: Error Domain=Parse Code=101 "The operation couldn't be completed. (Parse error 101.)" UserInfo=0x7ff9d410ee80 {error=object not found for get, code=101} Error: Error Domain=Parse Code=101 "The operation couldn't be completed. (Parse error 101.)" UserInfo=0x7ff9d410ee20 {error=object not found for get, code=101} Error: Error Domain=Parse Code=101 "The operation couldn't be completed. (Parse error 101.)" UserInfo=0x7ff9d41082a0 {error=object not found for get, code=101} 

---

第三次尝试 （使用后续的fetchIfNeeded（））：

 public func collectHashTags(#sender:UIViewController, withinGeoCoordinate geoPoint:PFGeoPoint) { var query = PFQuery(className:"Tag") // query.whereKey("lastGeo", nearGeoPoint:geoPoint, withinKilometers:2) dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), { let tagArray = query.findObjects() as [PFObject]? if tagArray != nil { let myTag = tagArray![0] println("***myTag: \\(myTag)") let myName = myTag["displayName"] as String println("displayName: \\(myName)") let myOwner = myTag["owner"] as PFUser myOwner.fetchIfNeeded() println("**** myOwner: \\(myOwner)") } }); } 

输出：

 ***myTag: <Tag: 0x7fa5d87e8f70, objectId: 5J1dNXUdaM, localId: (null)> { Media = ( 3, 2, 1 ); accessPemission = 1; description = "Hashbrown Potatoes"; displayName = Smirf123; endTime = "2104-12-17 20:20:00 +0000"; geoPoint = "<PFGeoPoint: 0x7fa5de104770, latitude: 40.000000, longitude: -30.000000>"; owner = "<PFUser: 0x7fa5de108070, objectId: hk7zYRK4xB>"; public = 1; radius = 2000; startTime = "2104-12-15 20:20:00 +0000"; } displayName: Smirf123 2014-12-14 15:09:12.004 Bliss2[4757:181319] Error: object not found for get (Code: 101, Version: 1.5.0) **** myOwner: <PFUser: 0x7fa5de108070, objectId: hk7zYRK4xB, localId: (null)> { } 

我在这里迷路了。
用托管记录分发PFUser指针应该不会很困难。
如何从“所有者”（PFUser）获取/提取（字符串和图像）属性？

Answer 1

因此，理解此问题的关键是认识到在打印出PFObject时<..>中的对象实际上是可索引的数组。

因此，如果说“ tag”是您要返回的PFObject，并且想要获取它的Media属性（如println输出所示），则可以使用：tag [“ Media”]。

在我的代码中，我从objectID的解析中获取了PFObject，但我认为这并不重要。

希望这能回答您的问题。