CODEWITHSUNDEEP
iosswiftfirebasefirebase-realtime-database
Komal Kamble
Komal Kamble

Reputation: 422

How to update particular value of child in Firebase DB

I am following this document. Following is my code for update:

func updateDealResultToServer(key:String,dealResult : String)
{

    let post = ["dealResul": dealResult]
    let childUpdates =
        ["/komal_xyz/\(key)": post
        ]

    rootRef.updateChildValues(childUpdates)

}

This Is my Firebase database structure: enter image description here

I want to only change the value for dealResult. Whenever I try to run above code for particular child node like 1473670100726, other value except dealResul is deleted.

Upvotes: 3

Views: 15841

Answers (3)

Er. Deependra Thakur
Er. Deependra Thakur

Reputation: 9

let ref = FIRDatabase.database().reference().root.child("users").child("childKey").updateChildValues(["childKeyForUpdate": "NewData"])

Upvotes: 1

Dravidian
Dravidian

Reputation: 9945

For Updating values at a particular node in Firebase Realtime Database, use:-

  • You can either use runTransactionBlock:

      func updateTotalNoOfPost(completionBlock : (() -> Void)){


let prntRef = FIRDatabase.database().reference().child("komal_kyz").child(your_AuroID).child("dealResul")

prntRef.runTransactionBlock({ (resul) -> FIRTransactionResult in
    if let dealResul_Initial = resul.value as? Int{

        //resul.value = dealResul_Initial + 1
        //Or HowSoEver you want to update your dealResul. 
         return FIRTransactionResult.successWithValue(resul)
    }else{

        return FIRTransactionResult.successWithValue(resul)

    }
    }, andCompletionBlock: {(error,completion,snap) in

            print(error?.localizedDescription)
            print(completion)
            print(snap)
        if !completion {

           print("Couldn't Update the node")
        }else{

            completionBlock()
        }
    })

 }

    While calling this function:- 

    updateTotalNoOfPost{
       print("Updated")
      }

  • Or just call updateValues

        let prntRef  = FIRDatabase.database().reference().child("komal_kyz").child(your_AuroID)
    prntRef.updateChildValues(["dealResul":dealResult])

PS:- Prefer using runTransactionBlock: instead of .updateChildValues if you only want to increment a particular node. Also read this: -https://stackoverflow.com/a/39458044/6297658

Upvotes: 7

tech4242
tech4242

Reputation: 2468

I suggest using setValue for single child updates (keep in mind that I am using Swift 3, slight syntax changes may apply but you should be fine):

rootRef.child("komal_kyz").child(key).setValue(["dealResul":dealResult])

Upvotes: 5

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