Hi, I have a problem with downloading all collections from the document. I would like after finding the id (userUid) document to be able to download all its collections, I need the id of each of these collection
export const getAllMessagesByUserId = async (userUid) => {
const result = await firebase
.firestore()
.collection('messages')
.doc(userUid)
.onSnapshot((snapshot) => {
console.log(snapshot);
});
};
I wrote an article which proposes solutions to this problem: How to list all subcollections of a Cloud Firestore document? As a matter of fact, "retrieving a list of collections is not possible with the mobile/web client libraries" as explained in the Firestore documentation.
I would suggest you use the second method proposed in the article, using a Cloud Function.
Here is the code copied from the article.
Cloud Function:
const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp();
exports.getSubCollections = functions.https.onCall(async (data, context) => {
const docPath = data.docPath;
const collections = await admin.firestore().doc(docPath).listCollections();
const collectionIds = collections.map(col => col.id);
return { collections: collectionIds };
});
Example of calling the Cloud Function from a web app:
const getSubCollections = firebase
.functions()
.httpsCallable('getSubCollections');
getSubCollections({ docPath: 'collectionId/documentId' })
.then(function(result) {
var collections = result.data.collections;
console.log(collections);
})
.catch(function(error) {
// Getting the Error details.
var code = error.code;
var message = error.message;
var details = error.details;
// ...
});