Push Notification Example

pn.ts

import gcm = require('node-gcm');
let sender = new gcm.Sender('YOUR_GCM_SENDER_ID'); // this is basically your API key


function sendPushNotification(message, gcmIds){

  sender.send(message, {registerationTokens: gcm_ids}, (err, response) => {
    if(err) console.log(err);
    console.log(response);
  });

}

function notifyAboutLike(postId, userId){

  // first lets get the post from mongoose
  Post.findById(postId, (err, post) => {

    let message = new gcm.Message({
      notification: {
        title: 'New post like',
        body: 'Someone just liked your post ' + post.postTitle
      },
      data: {
        postId: postId // you can read this value in the app, and let your app open that post automatically
      }
    });
    
    // lets get that user's GCM_ID
    PushNotificationRegisterations.find({
      user: userId
    }, (err, doc) => {
      
      sendPushNotification(message, [doc.gcm_id]);
      
    });
    
  });

}