I am trying to get the key of the last node I have just pushed to on firebase but my code keeps erroring

constructor (props) {
super(props)
this.cartFirebase = firebaseApp.database().ref('carts')


}

  ponentDidMount () {
    this.cartFirebase.child(DeviceInfo.getUniqueID() + '/items').push({
      item: this.props.data.name,
      qty: 1
    })
    this.cartFirebase.limit(1).on('child_added', function(snapshot) {
      console.log(snapshot)
    })
  }

I am trying to get the key of the last node I have just pushed to on firebase but my code keeps erroring

constructor (props) {
super(props)
this.cartFirebase = firebaseApp.database().ref('carts')


}

  ponentDidMount () {
    this.cartFirebase.child(DeviceInfo.getUniqueID() + '/items').push({
      item: this.props.data.name,
      qty: 1
    })
    this.cartFirebase.limit(1).on('child_added', function(snapshot) {
      console.log(snapshot)
    })
  }

• javascript
• firebase
• react-native
• firebase-realtime-database

• What's the error you get? – Frank van Puffelen Commented May 21, 2017 at 15:01
• hi @FrankvanPuffelen added the error – Boss Nass Commented May 22, 2017 at 8:30
• As the error message says limit() is not a function. Are you looking for limitToFirst() or limitToLast()? – Frank van Puffelen Commented May 22, 2017 at 14:20
• limit to last, wanted to get the most recent node that has been created – Boss Nass Commented May 23, 2017 at 9:01

1 Answer 1

You need to use limitToLast function.

this.cartFirebase.limitToLast(1).on('child_added', function(childSnapshot) {

     var snap = childSnapshot.val();

});