Executing Firebase Cloud Functions to perform write operations within a database event function

Exploring the world of Firebase functions has been an exciting learning journey for me. This innovative feature is proving to be incredibly powerful and beneficial.

I'm eager to utilize a function that can capture a database writing event, perform a comparison with a specific database location, and then write data accordingly in another part of the database based on the result of the comparison.

Below is the Node.js code I am currently working with:

exports.verificaFineLavoro = functions.database.ref('/Aziende/{nomeazienda}/LogAsegno/{pushidbracciante}/{pushidlog}/Asegno')
.onWrite(event => {
  const original = event.data.val();
  console.log('VerificaFineLavoro', event.params.pushId, original);
  const aSegno = original;
  console.log('aSegno', aSegno +"");
  const FineLavoro = ref.parent.parent.parent.parent.child("Asegno/"+aSegno+"/FineLavoro");
  return event.data.ref.child('FL').set(FineLavoro);
});

Although the function is successfully triggered, it encounters issues due to potentially incorrect references.

javascriptfirebasefirebase-realtime-databasegoogle-cloud-functions

Answer №1

The Firebase Cloud Functions documentation regarding database triggers includes code examples demonstrating how to interact with other nodes in the database.

As an illustration, this code snippet assigns a value as a sibling to the node that activated the function:

return event.data.ref.parent.child('uppercase').set(uppercase);

Here is another example from the sample related to counting child nodes:

exports.countlikechange = 
functions.database.ref('/posts/{postid}/likes/{likeid}').onWrite(event => {
  const collectionRef = event.data.ref.parent;
  const countRef = collectionRef.parent.child('likes_count');
  ...

To access the base of the database, utilize event.data.ref.root (to reach the root node using the credentials of the triggering user) or event.data.adminRef.root (for comprehensive administrative access to the root).

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