Firebase：从实时数据库中检索childByAutoID

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?

答

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)

Firebase：从实时数据库中检索childByAutoID

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