CODEWITHSUNDEEP
javascriptfirebaseionic-frameworkfirebase-realtime-database
Joy Cheng
Joy Cheng

Reputation: 41

Check if data exists in firebase using Ionic

I am trying to check if a certain value exists in my firebase real time database. However, it keeps saying that it does not exist. This is my code

check(){
       var checkRef = firebase.database().ref('users');

       checkRef.once('value', function(snapshot) {
        if(snapshot.val().hasOwnProperty('referralCode')) {
          console.log("Referral Code exist.");
        }
        else {
          console.log("Referral Code does not exist.");
        }
     });
 
 
 }

Thanks

I am using Ionic 5

Upvotes: 0

Views: 176

Answers (1)

Sergey Rudenko
Sergey Rudenko

Reputation: 9227

I think you are using javascript "hasOwnProperty" method while you need to use firebase provided method "hasChild":

// Assume we have the following data in the Database:
{
  "name": {
    "first": "Ada",
    "last": "Lovelace"
  }
}

// Determine which child keys in DataSnapshot have data.
var ref = firebase.database().ref("users/ada");
ref.once("value")
  .then(function(snapshot) {
    var hasName = snapshot.hasChild("name"); // true
    var hasAge = snapshot.hasChild("age"); // false
  });

So in your case should be something like:

check(){
       var checkRef = firebase.database().ref('users');

       checkRef.once('value', function(snapshot) {
        if(snapshot.hasChild('referralCode')) {
          console.log("Referral Code exist.");
        }
        else {
          console.log("Referral Code does not exist.");
        }
     });
 
 }

Upvotes: 1

Related Questions