使用指针在解析中查询行(iOS) [英] Query row in Parse using Pointer (ios)

问题描述

我正在尝试从Parse中的ComparablePhotos类中获取一行数据.但是，我想从ComparablePhotos中获得的唯一一行是其指针的列"Parent"与我拥有的字符串变量markerObjectId(例如inI9tJ8x7)具有相同的objectId(在NewLog中).我将在ComparablePhotos中使用简单的查询，其中键"Parent"等于markerObjectId，但是Parent是一个指针，而不是字符串.

如何从ComparablePhotos中获取行，其指针列"Parent"的NewLog objectId与markerObjectId相同?  类似的东西，例如ComparablePhotos行的Parent.objectId == markerObjectId，是将该行存储到变量中吗?

I am trying to get a row of data from the class, ComparablePhotos in Parse. However, the only row from ComparablePhotos I want to get, is the row whose pointer, column "Parent", has the same objectId (in NewLog) as a string variable I have, markerObjectId, ex: inI9tJ8x7. I would use the simple query in ComparablePhotos where key "Parent" is equal to markerObjectId, but Parent is a pointer, and not a string.

How do I grab the row from ComparablePhotos whos whose pointer, column "Parent", has the same NewLog objectId as a markerObjectId?  Something along the lines like if the ComparablePhotos row's Parent.objectId == markerObjectId, store that row into a variable?

Parse中的ComparablePhotos类. 父母"列是一个指针.

ComparablePhotos class in Parse. "Parent" column is a pointer.

NewLogClass.指针指向此处.

NewLogClass. The pointer points here.

这是我的代码:

    var newLogObjectsArray: [PFObject] = [PFObject]()

    //newLogObjectId is a string im comparing to, ex: inI9tJ8x7
    newLogObjectId = objectIdArray[markerIndex]

    var picquery = PFQuery(className:"ComparablePhotos")
    picquery.selectKeys(["objectId", "Images", "LocationType", "Parent"])
    picquery.includeKey("Parent.objectId")
    picquery.orderByAscending("createdAt")
    picquery.findObjectsInBackgroundWithBlock { (NewLog, error) -> Void in

        //Here prints are all our rows from the class, ComparablePhotos.
        println("NewLog")

        if let NewLog = NewLog as? [PFObject] {
            for log in NewLog {
                //Here are all our rows from the class, NewLog.
                var ParseNewLogClass: PFObject = (log["Parent"] as? PFObject)!
                self.newLogObjectsArray.append(ParseNewLogClass)
            }

推荐答案

您当前的代码:

var picquery = PFQuery(className:"ComparablePhotos")
picquery.selectKeys(["objectId", "Images", "LocationType", "Parent"])
picquery.includeKey("Parent.objectId")
picquery.orderByAscending("createdAt")

• 为ComparablePhotos
创建查询
• 询问是否要返回一组有限的数据字段(selectKeys)
• 要求将关联对象(错误地)包含在响应中(includeKey)
• 订购结果
• creates a query for ComparablePhotos
• asks for a limited set of data fields to be returned (selectKeys)
• asks for an associated object to be included in the response (incorrectly) (includeKey)
• orders the results

您真正想要的是在响应中获取完整的对象详细信息，并按指定的父对象进行过滤.为此，您需要为拥有的父对象ID详细信息创建一个PFObject(请参阅objectWithoutDataWithClassName:objectId:)，然后使用whereKey:equalTo:.

What you actually want is to get the full object details in the response and to filter by a specified parent. To do that you need to create a PFObject for the parent object id details you have (see objectWithoutDataWithClassName:objectId:) and then use whereKey:equalTo:.

var picquery = PFQuery(className:"ComparablePhotos")
picquery.includeKey("Parent")
picquery.whereKey("Parent", equalTo:parentObject)
picquery.orderByAscending("createdAt")

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