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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)

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?

Dravidian
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Code Ratchet
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1 Answers1

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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)

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..

Alternative :- 

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)
Dravidian
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  • Working, Thanks @Dravidian – Code Ratchet Sep 05 '16 at 10:34
  • Thanks @Dravidian – Vinoth Vino Aug 03 '17 at 11:03
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    Note that childByAutoId() *does* return a time-sortable ID: "The unique key generated by childByAutoId: is prefixed with a client-generated timestamp so that the resulting list will be chronologically-sorted." https://firebase.google.com/docs/reference/swift/firebasedatabase/api/reference/Classes/DatabaseReference – Justin Fyles Jul 10 '18 at 16:41