ios - Firebase Retrieving Data in Swift -

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i'm trying retrieve specific data logged in user. data in database looks this:

enter image description here

for example, want grab full_name , save in variable username. below i'm using grab data 

ref.queryorderedbychild("full_name").queryequaltovalue("useridentifier").observesingleeventoftype(.childadded, withblock: { snapshot in             print(snapshot.value)             // let username = snapshot.value["full_name"] as! string         })

unfortunately, console prints.

enter image description here

i appreciate :) thank you!

it gives warning message indexon because doing query.

you should define keys indexing on via .indexon rule in security , firebase rules. while allowed create these queries ad-hoc on client, see improved performance when using .indexon

as know name looking can directly go node, without query.

    let ref:firdatabasereference! // ref ie. root.child("users").child("stephenwarren001@yahoo.com")      // need fetch once use single event      ref.observesingleeventoftype(.value, withblock: { snapshot in          if !snapshot.exists() { return }          //print(snapshot)          if let username = snapshot.value["full_name"] as? string {             print(username)         }         if let email = snapshot.value["email"] as? string {             print(email)         }          // can use         // snapshot.childsnapshotforpath("full_name").value as! string     })

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