CODEWITHSUNDEEP
javascriptfirebasegoogle-cloud-platformfirebase-realtime-databasegoogle-cloud-functions
Subhendu Kundu
Subhendu Kundu

Reputation: 3856

Firebase auto deleting function deleting element in secs when asked to delete after 2 hours

I couldn't figure what am I doing wrong so need an extra eye to figure out what am I doing wrong. I am trying out one the question's answer from Delete firebase data older than 2 hours which uses https://github.com/firebase/functions-samples/tree/master/delete-old-child-nodes and https://github.com/firebase/functions-samples/blob/master/delete-old-child-nodes/functions/index.js to delete a node after a time.

/root
  /items
    LoHgJSFt8hHi2o_hP: {
      timestamp: 1497911193083,
      ...some_other_data
    },
    LoHgJSsGGHi2o_fD: {
      timestamp: 1597911193083  
      ...some_other_data                  
    }

My index.js looks like

//index.js
const functions = require('firebase-functions');
const admin = require('firebase-admin');
const { createUser } = require('./auth/onCreate');
const { deleteOldData } = require('./auth/onDeleteOldData');
const serviceAccount = require('./ownerstown-admin.json');
admin.initializeApp({
  credential: admin.credential.cert(serviceAccount),
  databaseURL: 'https://ownexxxxxxxx-c86cf.firebaseio.com'
});
exports.createUser = functions.firestore.document('users/{userId}').onCreate(createUser);
exports.deleteOldData = functions.database.ref('/referralIds/ids/{pushId}').onWrite(deleteOldData);

and then onDeleteOldData.js

// auth/onDeleteOldData.js
const CUT_OFF_TIME = 2 * 60 * 60 * 1000;
async function deleteOldData(change) {
  console.log('starting nooowwwwwww');
  const ref = change.after.ref.parent;
  console.log('ref', ref);
  const now = Date.now();
  const cutoff = now - CUT_OFF_TIME;
  const oldItemsQuery = ref.orderByChild('timestamp').endAt(cutoff);
  const snapshot = await oldItemsQuery.once('value');
  console.log('snapshot', snapshot);
  const updates = {};
  snapshot.forEach(child => {
    updates[child.key] = null;
  });
  return ref.update(updates);
}
module.exports = {
  deleteOldData
};

and pushing the data in a button click like

  function createLoginId() {
    const rootRef = Firebase.database.ref();
    const allDetails = rootRef.child('referralIds/ids');
    const timeStamp = Date.now();
    const someId = uuidv4();
    const { origin } = window.location;
    const data = {
      timeStamp,
      someId,
      createrId: id
    };
    const newRef = allDetails.push();
    newRef.set(data);
  }

But as soon as I push the data, it gets deleted in secs.

What am doing wrong?

Upvotes: 0

Views: 255

Answers (1)

Renaud Tarnec
Renaud Tarnec

Reputation: 83153

The problem comes from the fact that when you write to the database you do 

const timeStamp = Date.now();
//...
const data = {
  timeStamp,
  someId,
  createrId: id
};

which means that you save a field timeStamp, but your Cloud Function selects the node(s) to be deleted based on timestamp (all in lower case).

Node names in the Realtime Database are case sensitive.

BTW, note that for the timestamp you could use

const timestamp = firebase.database.ServerValue.TIMESTAMP;

which is "a placeholder value for auto-populating the current timestamp as determined by the Firebase servers", see https://firebase.google.com/docs/reference/js/firebase.database.ServerValue

Upvotes: 1

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