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TypeError: Cannot read property 'curr_uid' of undefined at exports.sendNotification.functions.database.ref.onWrite.event [duplicate]

Firebase TypeError: Cannot read property 'val' of undefinedFirebase functions: cannot read property 'user_id' of undefinedDetecting an undefined object propertyHow to check empty/undefined/null string in JavaScript?How can I merge properties of two JavaScript objects dynamically?How do I remove a property from a JavaScript object?Sort array of objects by string property valueHow to determine if variable is 'undefined' or 'null'?How to check for “undefined” in JavaScript?Read environment variables in Node.jsIs there a standard function to check for null, undefined, or blank variables in JavaScript?Iterate through object properties

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0

This question already has an answer here:

• 
  Firebase functions: cannot read property 'user_id' of undefined
  
  1 answer
  
  


• 
  Firebase TypeError: Cannot read property 'val' of undefined
  
  2 answers
  
  

I am writing a program to get the value of a current user ID from inside Notifications node of firebase. From there I want to fetch the details of that user whose ID is stored in the Notification node. But I am getting the error of cannot read property of curr_uid of undefined

This is my index.js file

const functions = require('firebase-functions');
const admin = require ('firebase-admin');
admin.initializeApp (functions.config().firebase);

exports.sendNotification = functions.database.ref('/Notifications/curr_uid').onWrite(event =>
 

 const curr_uid = event.params.curr_uid;

 console.log ('uid',curr_uid);

 return admin.database().ref('Notifications/curr_uid').once('value').then(snapshot =>
 
 if(snapshot.exists())
 
 const sender_uid = snapshot.val().By;

 console.log('New notification from ',sender_uid);
 
 );

 const payload = 
 notification: 
 title: "New Post",
 body: "A new post is added",
 icon: "default"
 
 ;

 return admin.database().ref('Tokens').once('value').then(allToken => 
 
 if(allToken.val())
 
 console.log('token available');
 const token = Object.keys(allToken.val());
 return admin.messaging().sendToDevice(token,payload);
 
 else
 
 console.log('No token available');

 
 );


 );

I expect to send push notification to all devices when a current user id childnode is added to Notifications node for that curr_uid. I want to fetch "By" child key and value inside that curr_uid node so that i can use it later to send notifications by user's name.

This is the Notifications Node in my firebase database

javascript node.js firebase

share|improve this question

edited Mar 28 at 5:13

Midhun Darvin

1,0521212 silver badges2222 bronze badges

asked Mar 28 at 4:58

shivali shrivastavashivali shrivastava

122 bronze badges

marked as duplicate by Peter Haddad firebase
Users with the  firebase badge can single-handedly close firebase questions as duplicates and reopen them as needed.

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Mar 28 at 6:31

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Try to log the event parameter and check if curr_uid is there or not.
  
  – RopAli Munshi
  Mar 28 at 5:01
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Are you using some old documentation or tutorial? The API for onWrite functions changed quite a while ago. firebase.google.com/docs/reference/functions/…
  
  – Doug Stevenson
  Mar 28 at 5:05
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yes i am using a old tutorial
  
  – shivali shrivastava
  Mar 28 at 5:08
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Ok thanks i will refer this for my cloud function
  
  – shivali shrivastava
  Mar 28 at 5:10
  

  
  
  
  

add a comment | 

0

This question already has an answer here:

• 
  Firebase functions: cannot read property 'user_id' of undefined
  
  1 answer
  
  


• 
  Firebase TypeError: Cannot read property 'val' of undefined
  
  2 answers
  
  

I am writing a program to get the value of a current user ID from inside Notifications node of firebase. From there I want to fetch the details of that user whose ID is stored in the Notification node. But I am getting the error of cannot read property of curr_uid of undefined

This is my index.js file

const functions = require('firebase-functions');
const admin = require ('firebase-admin');
admin.initializeApp (functions.config().firebase);

exports.sendNotification = functions.database.ref('/Notifications/curr_uid').onWrite(event =>
 

 const curr_uid = event.params.curr_uid;

 console.log ('uid',curr_uid);

 return admin.database().ref('Notifications/curr_uid').once('value').then(snapshot =>
 
 if(snapshot.exists())
 
 const sender_uid = snapshot.val().By;

 console.log('New notification from ',sender_uid);
 
 );

 const payload = 
 notification: 
 title: "New Post",
 body: "A new post is added",
 icon: "default"
 
 ;

 return admin.database().ref('Tokens').once('value').then(allToken => 
 
 if(allToken.val())
 
 console.log('token available');
 const token = Object.keys(allToken.val());
 return admin.messaging().sendToDevice(token,payload);
 
 else
 
 console.log('No token available');

 
 );


 );

I expect to send push notification to all devices when a current user id childnode is added to Notifications node for that curr_uid. I want to fetch "By" child key and value inside that curr_uid node so that i can use it later to send notifications by user's name.

This is the Notifications Node in my firebase database

javascript node.js firebase

share|improve this question

edited Mar 28 at 5:13

Midhun Darvin

1,0521212 silver badges2222 bronze badges

asked Mar 28 at 4:58

shivali shrivastavashivali shrivastava

122 bronze badges

marked as duplicate by Peter Haddad firebase
Users with the  firebase badge can single-handedly close firebase questions as duplicates and reopen them as needed.

StackExchange.ready(function()
if (StackExchange.options.isMobile) return;

$('.dupe-hammer-message-hover:not(.hover-bound)').each(function()
var $hover = $(this).addClass('hover-bound'),
$msg = $hover.siblings('.dupe-hammer-message');

$hover.hover(
function()
$hover.showInfoMessage('',
messageElement: $msg.clone().show(),
transient: false,
position: my: 'bottom left', at: 'top center', offsetTop: -7 ,
dismissable: false,
relativeToBody: true
);
,
function()
StackExchange.helpers.removeMessages();

);
);
);
Mar 28 at 6:31

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Try to log the event parameter and check if curr_uid is there or not.
  
  – RopAli Munshi
  Mar 28 at 5:01
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Are you using some old documentation or tutorial? The API for onWrite functions changed quite a while ago. firebase.google.com/docs/reference/functions/…
  
  – Doug Stevenson
  Mar 28 at 5:05
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yes i am using a old tutorial
  
  – shivali shrivastava
  Mar 28 at 5:08
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Ok thanks i will refer this for my cloud function
  
  – shivali shrivastava
  Mar 28 at 5:10
  

  
  
  
  

add a comment | 

This question already has an answer here:

• 
  Firebase functions: cannot read property 'user_id' of undefined
  
  1 answer
  
  


• 
  Firebase TypeError: Cannot read property 'val' of undefined
  
  2 answers
  
  

I am writing a program to get the value of a current user ID from inside Notifications node of firebase. From there I want to fetch the details of that user whose ID is stored in the Notification node. But I am getting the error of cannot read property of curr_uid of undefined

This is my index.js file

const functions = require('firebase-functions');
const admin = require ('firebase-admin');
admin.initializeApp (functions.config().firebase);

exports.sendNotification = functions.database.ref('/Notifications/curr_uid').onWrite(event =>
 

 const curr_uid = event.params.curr_uid;

 console.log ('uid',curr_uid);

 return admin.database().ref('Notifications/curr_uid').once('value').then(snapshot =>
 
 if(snapshot.exists())
 
 const sender_uid = snapshot.val().By;

 console.log('New notification from ',sender_uid);
 
 );

 const payload = 
 notification: 
 title: "New Post",
 body: "A new post is added",
 icon: "default"
 
 ;

 return admin.database().ref('Tokens').once('value').then(allToken => 
 
 if(allToken.val())
 
 console.log('token available');
 const token = Object.keys(allToken.val());
 return admin.messaging().sendToDevice(token,payload);
 
 else
 
 console.log('No token available');

 
 );


 );

I expect to send push notification to all devices when a current user id childnode is added to Notifications node for that curr_uid. I want to fetch "By" child key and value inside that curr_uid node so that i can use it later to send notifications by user's name.

This is the Notifications Node in my firebase database

javascript node.js firebase

share|improve this question

edited Mar 28 at 5:13

Midhun Darvin

1,0521212 silver badges2222 bronze badges

asked Mar 28 at 4:58

shivali shrivastavashivali shrivastava

122 bronze badges

const functions = require('firebase-functions');
const admin = require ('firebase-admin');
admin.initializeApp (functions.config().firebase);

exports.sendNotification = functions.database.ref('/Notifications/curr_uid').onWrite(event =>
 

 const curr_uid = event.params.curr_uid;

 console.log ('uid',curr_uid);

 return admin.database().ref('Notifications/curr_uid').once('value').then(snapshot =>
 
 if(snapshot.exists())
 
 const sender_uid = snapshot.val().By;

 console.log('New notification from ',sender_uid);
 
 );

 const payload = 
 notification: 
 title: "New Post",
 body: "A new post is added",
 icon: "default"
 
 ;

 return admin.database().ref('Tokens').once('value').then(allToken => 
 
 if(allToken.val())
 
 console.log('token available');
 const token = Object.keys(allToken.val());
 return admin.messaging().sendToDevice(token,payload);
 
 else
 
 console.log('No token available');

 
 );


 );

share|improve this question

edited Mar 28 at 5:13

Midhun Darvin

1,0521212 silver badges2222 bronze badges

asked Mar 28 at 4:58

shivali shrivastavashivali shrivastava

122 bronze badges

share|improve this question

edited Mar 28 at 5:13

Midhun Darvin

1,0521212 silver badges2222 bronze badges

asked Mar 28 at 4:58

shivali shrivastavashivali shrivastava

122 bronze badges

edited Mar 28 at 5:13

Midhun Darvin

1,0521212 silver badges2222 bronze badges

edited Mar 28 at 5:13

Midhun Darvin

1,0521212 silver badges2222 bronze badges

asked Mar 28 at 4:58

shivali shrivastavashivali shrivastava

122 bronze badges

asked Mar 28 at 4:58

shivali shrivastavashivali shrivastava

122 bronze badges