小编Aar*_*ron的帖子

exports.addDeviceToUser = functions.firestore.document('device-names/{device}').onUpdate((change, context) => {
    const currentUser = admin.auth().currentUser;
    const deviceName = context.params.device;
    var usersRef = db.collection('users');
    var queryRef = usersRef.where('uid', '==', currentUser.uid);

    if (authVar.exists) {
        return queryRef.update({sensors: deviceName}).then((writeResult => {
        return console.log('Device attached');
        }));
    } else {return console.log('Device attachment failed, user not signed in');}
});