how to set server time stamp with firestore admin

Question

const firebase = require('@firebase/app').default;
require('@firebase/firestore')

const admin = require('firebase-admin')
const functions = require('firebase-functions')

// initialize the admin SDK...    

exports.setUpdatedDate = functions.firestore.document('/foos/{fooId}/bars/{barId}')
    .onCreate(event => {
      admin.firestore().collection('foos').doc( event.params.fooId )
            .set({
                updatedDate: firebase.firestore.FieldValue.serverTimestamp()
            }, {merge:true})
    })

Running the function shell above and I got:

Cannot encode type ([object Object]) to a Firestore Value
at Function.encodeValue (...\functions\node_modules\@google-cloud\firestore\src\document.js:772:11

so how to set server time stamp with firestore admin nodejs sdk?

Answer 1

You can use admin.firestore.FieldValue.serverTimestamp().

API docs: https://firebase.google.com/docs/reference/admin/node/admin.firestore.FieldValue Example usage: https://github.com/firebase/firebase-admin-node/blob/master/test/integration/firestore.js#L61