How do you get to the values of ALL the tokens on your server?

Question

I'd like to get the collection of ALL my FCM user iOS device tokens from this path in my Firebase Database:

BootCamp/Notifications/iOS

At this location, an autoIDChild is created to store the users' device tokens as "deviceToken".

I've been trying to follow the cloud_functions example at this link, but as my use-case is different it's been a little tough to figure out. Here's my cloud-function code in JS:

exports.iOSPush = functions.database.ref('/BootCamp/Bulletins/date').onWrite((snapShot, context) =>{

let tokensSnapShot
let tokens

//here, I attempt to get access to all iOS tokens on my server
const getTokens = admin.database().ref('/BootCamp/Notifications/iOS/{key}').once('value');

return Promise.all([getTokens]).then( (results) => {
tokensSnapShot = results[0]
tokens = Object.keys(tokensSnapShot)

const payload = {
  notification:{
    title: 'congrats it works',
    body: 'Cloud function noti for ios',
    sound: 'default',
    badge: '1'
    }
};
  //tokens value in the console log is: "node_,ref_,index_". I was expecting an array of tokens:/
  return  admin.messaging().sendToDevice(tokens, payload)  
})
});

How do I get to these iOS tokens on my server?

Answer 1

It finally occurred to me that I had to name the childPath the same as the device token instead of a randomly generated childID.

Answer 2

Please check this example:

  return Promise.all([admin.database().ref(`/users/${user}/account/tokensArray`).once('value')]).then(results => {
    const tokens = results[0];
    if (!tokens.hasChildren()) return null;
    let payload = {
      notification: {
        title: 'title',
        body: 'message',
        icon: 'icon-192x192.png'
      }
    };
    const tokensList = Object.keys(tokens.val());
    return admin.messaging().sendToDevice(tokensList, payload);
  });