Example cloud function that handles processing Firebase DB data into Firestore

cloud-function_db-to-firestore.js

//this cloud function listens to new records, 
// then process them to create models aligned with App logic which is using Firestore. 

function firestoreRecord_parkingnorway(dbRecord) {
  let firestoreRecord = {};
  
  // this method creates a mapped version according to app logic  
  // etc etc etc ....
  
  return firestoreRecord;
}

exports.parkingNorway = functions
    .runWith(runtimeOpts)
    .region(regionName)
    .database.ref('/parking_norway/{recordId}')
    .onCreate(async (snap, context) => {

        const dbRecord_parkingnorway = snap.val();
        console.log('...newDbRecord with recordId:', context.params.recordId, JSON.stringify(dbRecord_parkingnorway));

        let firestoreRecord = firestoreRecord_parkingnorway(dbRecord_parkingnorway);
        
        // Create a GeoFirestore reference
        const geofirestore = new GeoFirestore(firebaseAdmin.firestore());
        // Create a GeoCollection reference
        const geocollection = geofirestore.collection('parking_norway');
        await geocollection.add(firestoreRecord);

        return true;
    });