Unable to fetch data from Firebase Firestore in react native

Question

I am trying to GET data from Firestore but I cannot see data coming. I am building a react-native app. I am using react-native-firebase.

I also tried Transactions method from react-native-firebase documentation. But nothing is working.

Here' my code:

firebase.firestore().collection('users').doc(uid)
          .get()
          .then((doc)=>{ 
                  console.log(doc)
                  console.log(doc.data().shoppinglist)   
          })
          .catch(e => console.log(e));

Console logging .get() gives me a Promise.

I am getting the Promise like this:

Promise {_40: 0, _65: 0, _55: null, _72: null}
_40: 0
_55: null
_65: 0
_72: null

But .then() doesn't executes as the two console.log() ain't logging anything.

Please help me out here. Quite new with Firebase.

ofcourse I do Sir. I'm able to write data on that collection. — Saumay Paul, Apr 02 '19 at 21:07

Saumay Paul · Accepted Answer · 2019-04-08T19:19:03.940

9

After some digging in Firebase Documentation, I found out a solution.

Collection references and document references are two distinct types of references and let you perform different operations. For example, you could use a collection reference for querying the documents in the collection, and you could use a document reference to read or write an individual document.

Therefore, Replacing firebase.firestore().collection('users').doc(uid) with firebase.firestore().doc(`users/${uid}`) solved my problem.

edited Apr 08 '19 at 19:19

answered Apr 03 '19 at 07:03

Saumay Paul

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This worked!!! Can you share how you performed your digging, and whats the root cause? – udit bansal Apr 08 '19 at 02:44
I have updated my answer. Hope it helps! @uditbansal – Saumay Paul Apr 08 '19 at 19:19
but what about when you want the whole collection? a list of objects, how you achieve that? – kavain Jun 30 '20 at 22:52

score 0 · Answer 2 · answered Oct 24 '21 at 17:45

For dummies in firebase like me, if you want a custom document id, you have to specify it when writing data to firestore

import firestore from '@react-native-firebase/firestore';

firestore()
  .collection('Users')
  .doc('ABC')
  .set({
    name: 'Ada Lovelace',
    age: 30,
  })
  .then(() => {
    console.log('User added!');
  });

Then you can get it by

import firestore from '@react-native-firebase/firestore';

const user = await firestore().collection('Users').doc('ABC').get();

For reference: https://rnfirebase.io/firestore/usage#writing-data

Unable to fetch data from Firebase Firestore in react native

2 Answers2

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