How to access another array and loop through it in Firebase Functions [duplicate]

Question

So in my firebase app, I want to access an array whenever the data source is updated.

This part of app works well. The variables are assigned successfully.

exports.sendUsersNotification = functions.database.ref('/Groups/{groupId}/messageList/{messageId}/')
.onWrite(event => {
  const original = event.data.val();
  let userId = original['userId']
  let groupId = event.params.groupId;
  let messageId = event.params.messageId;

  const payload = {
    notification: {
      title: 'Messenger',
      body: 'You have a new message'
    }
  };



});

The array I want to access and loop through is in 'Groups/{groupId}/listeners'.

How can I access it?

Doug Stevenson · Accepted Answer · 2017-12-01 18:43:38Z

1

Cloud Functions database triggers will only give you the data at the location in the database that matches the pattern you gave in functions.database.ref(). You can use the Admin SDK to query the database at other locations, or you can use event.data.ref.root to build a Reference to other locations, and use once() to perform the query. There are a lot of examples of this in documentation and samples.

edited Dec 1, 2017 at 18:43

answered Dec 1, 2017 at 14:08

Doug Stevenson

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1 Comment

Doug Stevenson Over a year ago

@BobSnyder That's right, I made a mistake, will correct. No one should be using on() in a function, really.

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