CODEWITHSUNDEEP
javascriptfirebasegoogle-cloud-platformgoogle-cloud-firestoregoogle-cloud-functions
Frank
Frank

Reputation: 2441

Firebase functions/firestore not working and catch returning an empty object

I would just like to access my Firestore Database from within my Firebase Functions. I have tried to follow all the documentation and other stack overflow questions but still it is not working. Here is my code:

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

exports.test = functions.https.onRequest((request, response) => {
  admin
    .firestore()
    .collection('users')
    .get()
    .then(querySnapshot => {
      const arrUsers = querySnapshot.map(element => element.data());
      return response.send(arrUsers);
    }).catch((error) => {
      // It is coming in here, and this below just returns '{}'
      response.send(error);
    });
});

What am I doing wrong?

Upvotes: 0

Views: 576

Answers (1)

Renaud Tarnec
Renaud Tarnec

Reputation: 83163

The get() method of a CollectionReference returns a QuerySnapshot which "contains zero or more DocumentSnapshot objects representing the results of a query. The documents can be accessed as an array via the docs property or enumerated using the forEach() method".

Therefore you should do as follows, calling map() on querySnapshot.docs:

exports.test = functions.https.onRequest((request, response) => {
  admin
    .firestore()
    .collection('users')
    .get()
    .then(querySnapshot => {
      const arrUsers = querySnapshot.docs.map(element => element.data());
      //return response.send(arrUsers);  //You don't need to use return for an HTTPS Cloud Function
      response.send(arrUsers);   //Just use response.send()
    }).catch(error => {
      //response.send(error);
      response.status(500).send(error)   //use status(500) here
    });
});

Note the changes to the code for returning the response and handling the error. I would suggest that you watch this official Firebase video on HTTPS Cloud Functions: https://www.youtube.com/watch?v=7IkUgCLr5oA, it's a must!

Upvotes: 4

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