Why does this child node not get removed in Firebase Cloud Functions?

Question

I'm trying to remove the event node once it expires and remove all it's children image of the event node before getting removed

the problem is when the time passes and i delete the event node all it's children get removed except this child

image of the event node after getting removed

source code

exports.removeOldEvents = functions.https.onRequest((req, res) => {
const eventsRef = admin.database().ref('events')
eventsRef.once('value', (snapshot) => {
    snapshot.forEach((child) => {
        child.forEach((child) => {
            if (1000*Number(child.val()['endDate']) <= new Date().getTime()) {
                child.ref.set(null)
          }
        })
    })
})
return res.status(200).end()
})

Answer 1

Since you call several time the set() method, which returns a promise, you should use Promise.all() in order to wait all the promises resolve before sending back the response.

The following adaptation of your code should work (not tested however):

exports.removeOldEvents = functions.https.onRequest((req, res) => {
   const eventsRef = admin.database().ref('events')

   eventsRef.once('value')
   .then((snapshot) => {
      const promises = [];
      snapshot.forEach((child) => {
          child.forEach((child) => {
              if (1000*Number(child.val().endDate) <= new Date().getTime()) {
                  promises.push(child.ref.set(null));
              }
          });
      });
      return Promise.all(promises);
   })
   .then(results => {
      const responseObj = {response: 'success'};
      res.send(responseObj);
   })
   .catch(err => {
      res.status(500).send(err);
   })
});