Question

我在PFUser数组中进行for循环，然后在for循环中我希望能够为已经循环的每个用户设置关键字段。由于某种原因，它只保存for循环中的最后一个元素。谁能解释我做错了什么？代码：

var user2ObjId = ["N7xqk8oFJx", "Q5lPX2DUmP", "mfkO8iypTB"]

let userQuery = PFUser.query()
        userQuery.whereKey("objectId", containedIn: user2ObjId)
        let foundUsers = userQuery.findObjects()
        if foundUsers.count > 0 {
            let addRoomObject = PFObject(className: "Room")
            for user in foundUsers {

                addRoomObject["user1"] = PFUser.currentUser()
                addRoomObject["user2"] = user

                addRoomObject.addObject(2, forKey: "questionNumbers")
                addRoomObject["matchCount"] = 1

            }
            addRoomObject.saveInBackgroundWithBlock({ (success: Bool, error: NSError!) -> Void in
                if success == true {
                   // println("Added new users to room")
                }
            })
        }

<{1>}数组中的

唯一保存的是user2ObjId。这是为什么？

Answer 1

如果查看for-in循环，则将属性设置为同一个实例，但是在退出循环时将保存，这在foundUsers中的最后一个元素已处理时发生 - 这解释了为什么只保存最后一个对象。

您可以使用saveAllInBackground

var array = [PFObject]()
for user in foundUsers {
  let addRoomObject = PFObject(className: "Room")

  addRoomObject["user1"] = PFUser.currentUser()
  addRoomObject["user2"] = user

  addRoomObject.addObject(2, forKey: "questionNumbers")
  addRoomObject["matchCount"] = 1

  array.append(addRoomObject)     
}

PFObject.saveAllInBackground(array, block({ (success: Bool, error: NSError!) -> Void in
   if success == true {
       // println("Added new users to room")
   }
})

for in循环只保存Parse中的最后一个元素。迅速

1 个答案: