Firebase：从实时数据库中检索childByAutoID [英] Firebase : Retrieve childByAutoID from Realtime Database

问题描述

我正在学习Firebase和iOS的绳索，所以请耐心等待。我目前在我的桌子上发帖名为帖子，如下所示：

I'm currently learning the ropes of Firebase and iOS so please bear with me. I'm currently posting to my table called Posts as shown here:

 let postInfo = ["Description": txtPostDescription.text!, "ImageUrl": imgUrl, "Likes": 0]

 var t = FIRDatabase.database().reference().child("Posts").childByAutoId().setValue(postInfo)

 print(t)

我正在尝试检索在插入新记录时创建的主键，但是我无法检索它。我已经尝试了 childByAutoId（）（但由于浏览网页而无法找到可靠的解决方案，这是随机猜测）。有什么想法吗？

I'm trying to retrieve the primary key that gets created when I insert the new record, however I'm unable to retrieve it. I've tried childByAutoId() (but that was a random guess due to browsing the web and not being able to find a solid solution). Any ideas?

推荐答案

let postInfo = ["Description": txtPostDescription.text!, "ImageUrl": imgUrl, "Likes": 0]

var reference  = FIRDatabase.database().reference().child("Posts").childByAutoId()

reference.setValue(postInfo)
let childautoID = reference.key 
print(childautoID)

注意： - Althogh childByAutoId（）来自 Firebase 的强大功能。但是，当您想要创建一个具有唯一键的节点时，更喜欢时间戳来存储数据。我更喜欢时间戳的原因是因为它们也可以帮助排序数据......但那就是我..

Note :- Althogh childByAutoId() is a great functionality from Firebase.But prefer timestamps to store the data into when you want to create a node with a unique key.The reason why i prefer timestamps is because they can also be helpful in sorting of data...But thats just me..

备选方案： -

let timeStamp = Int(NSDate.timeIntervalSinceReferenceDate()*1000) //Will give you a unique id every second or even millisecond if you want.. 
FIRDatabase.database().reference().child("Posts").child(timeStamp).setValue(postInfo)

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