ios - 解析检索指针对象

Question

我有以下 2 个解析类项目和类别。 Items 类有一个名为category 的列，它是一个指针，指向类中类别中的特定id。但是，当我想通过此指针从类别中检索数据时，它仅返回以下内容:

<Categories: 0x7ffddac633b0, objectId: dHbrk97s97, localId: (null)> {
}

这很奇怪，因为类别类包含名称、createdAt 和 UpdatedAt？为什么这些没有显示在这个对象中？

完整代码

func retrieveData() {
    //Query Item Information
    var query = PFQuery(className:"Items")
    query.findObjectsInBackgroundWithBlock {
        (objects: [AnyObject]?, error: NSError?) -> Void in

        if error == nil {
            // The find succeeded.

            // Do something with the found objects
            if let objects = objects as? [PFObject] {

                self.collectionView.reloadData()

                for object in objects {

                    var itemId = object.objectId!
                    var description = object["description"]! as! NSString
                    var createdAt = object.createdAt!
                    var title = object["title"]! as! NSString
                    var price = object["price"]! as! Int
                    var category = object["category"] as! PFObject


                    println(category)

                    //Query image
                    var query = PFQuery(className:"Images")
                    query.whereKey("imageId", equalTo:itemId)
                    query.whereKey("primaryImage", equalTo:true)
                    query.findObjectsInBackgroundWithBlock {
                        (objects: [AnyObject]?, error: NSError?) -> Void in

                        if error == nil {
                            // The find succeeded.
                            // Do something with the found objects
                            if let images = objects as? [PFObject] {
                                for image in images {
                                    //var primaryImage = image[]
                                }
                            }
                        } else {
                            // Log details of the failure
                            println("Error: \(error!) \(error!.userInfo!)")
                        }
                    }

                }


            }
        } else {
            // Log details of the failure
            println("Error: \(error!) \(error!.userInfo!)")
        }
    }

}

Answer 1

尝试在初始化 Items 查询后添加 include 方法:

var query = PFQuery(className:"Items")
query.includeKey("category")

当触发查询的获取时，此方法将检索指定的键。

https://parse.com/docs/ios/guide#queries-relational-queries