Malformed calls from JS: field sizes are different firebase react-native

January 12, 2023

i’m trying to automatically delete data older than 2 hours in the firebase real-time database, but after typing this code, it returns me a Malformed calls from JS:field sizes are different error.

function reloadDatas() {
  const ref = database().ref('messages/');

  const now = Date.now();
  const cutoff = now - 2 * 60 * 60 * 1000; // 1 minute in milliseconds

  const old = ref.orderByChild('timestamp').endAt(cutoff);

  old.once('value', function (snapshot) {
    snapshot.forEach(function (childSnapshot) {
      childSnapshot.ref.remove();
    });
  });
}

what am I doing wrong?

>Solution :

I didn’t test your code but we can see the following error in the code: The remove() method is asynchronous so you cannot call it in a forEach() loop. One solution is to use Promise.all() in order to call it a variable number of times in parallel.

So, the following shoudl do the trick (untested):

  old.once('value', function (snapshot) {
    const promises = [];
    snapshot.forEach(function (childSnapshot) {
      promises.push(childSnapshot.ref.remove());
    });
    Promise.all(promises)
  });