javascript - Firebase remove node based on child value - Stack Overflow

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I want to delete the entire node by query like delete * WHERE user_id = "-KTruPWrYO9WFj-TF8Ft" How can I achieve this on firebase?

-KVpQFXnzQkzzrowHxGk
  answer: "1"
  question_number: 2
  user_id: "-KTruPWrYO9WFj-TF8Ft"
-KVpQFXODhsAMJYFNjy7
  answer: "4"
  question_number: 25
  user_id: "-KTruPWrYO9WFj-TF8Ft"

I want to delete the entire node by query like delete * WHERE user_id = "-KTruPWrYO9WFj-TF8Ft" How can I achieve this on firebase?

-KVpQFXnzQkzzrowHxGk
  answer: "1"
  question_number: 2
  user_id: "-KTruPWrYO9WFj-TF8Ft"
-KVpQFXODhsAMJYFNjy7
  answer: "4"
  question_number: 25
  user_id: "-KTruPWrYO9WFj-TF8Ft"

• javascript
• json
• firebase
• firebase-realtime-database

Share Improve this question Follow edited Nov 6, 2016 at 6:15 Frank van Puffelen 600k8585 gold badges890890 silver badges860860 bronze badges asked Nov 5, 2016 at 18:15 Edyl Jay TempladoEdyl Jay Templado 13311 silver badge99 bronze badges

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1 Answer 1

Sorted by: Reset to default 14

To delete all references with child having some particular value first you will need to retrieve all keys ('-KVpQFXnzQkzzrowHxGk', '-KVpQFXnzQkzzrowHxGk' in your case) with equalTo query and then delete those references with remove function.

A sample code is here.

var ref = firebase.database(); //root reference to your data
ref.orderByChild('user_id').equalTo('-KTruPWrYO9WFj-TF8Ft')
    .once('value').then(function(snapshot) {
        snapshot.forEach(function(childSnapshot) {
        //remove each child
        ref.child(childSnapshot.key).remove();
    });
});

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