Develop Reference

Firebase Cloud Firestore Read-Write Data

i am trying to signup and save user info into firestore. Save operation is fine but i want to search that info but nothing happening. Here is my code
Signup
firestore
.collection("users")
.doc(user.userId)
.collection("profile")
.add({ ...user })
.then(() => {
auth.onAuthStateChanged((u) => {
if (u) {
u.updateProfile({
displayName: user.displayName,
});
}
});
});
Fetch All users data
firestore
.collection("users")
.get()
.then(function (querySnapshot) {
querySnapshot.forEach(function (doc) {
//doc.data() is never undefined for query doc snapshots
console.log(doc.id, " => ", doc.data());
});
});

You should be able to achieve by using a similar code as the below one. It very similar to yours, but with some differences, where we separate the referencing to the database and let the querySnapshot iterates by itself, so the data can be returned. I usually use this format to return data from collections.
var db = admin.firestore()
var usersReference = db.collection("users");
usersReference.get().then((querySnapshot) => {
querySnapshot.forEach((userDoc) => {
console.log(userDoc.id)
var userDocData = userDoc.data()
console.dir(userDocData)
})
})
This should work, so, in case it doesn't return anything, probably your saving opearation is not working properly. This will return both the user's id and the whole data from it.

Update data using firestore cloud function

I need help, i'm trying to update my comments collections using cloud function, but my code doesn't seem to work. My function succesfully run but doesn't update my avatarUrl when my userPhotoUrl is update
Here the whole path of the collection that i want to update : "/comments/{postId}/comments/{commentId}"
my firestore collection
exports.onUpdateUser2 = functions.firestore
.document("/users/{userId}")
.onUpdate(async (change, context) => {
const userUpdate = change.after.data();
const userId = context.params.userId;
const newPhotoUrl = userUpdate.photoUrl;
console.log("userId",userId);
console.log("newPhotoUrl",newPhotoUrl);
const querySnapshot = await admin.firestore().collection("comments").get();
querySnapshot.forEach(doc => {
console.log("doc",doc.data());
const postId = doc.id;
const comments = admin.firestore().collection("comments").doc(postId).collection("comments").where("userId","==",userId).get();
comments.forEach(doc2 => {
return doc2.ref.update({avatarUrl: newPhotoUrl});
});
});
});
Thank you,
UPDATE
I try to change the code, by using then to deal with these various promises but i don't really know why commentsRef.get() seem to return me empty querySnapshots, because the comments collections in my firestore database have multiple documents where in each documents there is a another comments collections where in this seconds comments collections there is a bunch of documents containing data. With this whole path i don't know how to iterate until being in the documents containing the data that i need to update. Can someone help me please ?
exports.onUpdateUserUpdateComments = functions.firestore
.document("/users/{userId}")
.onUpdate(async (change, context) => {
const userUpdate = change.after.data();
const userId = context.params.userId;
const newPhotoUrl = userUpdate.photoUrl;
console.log("userId",userId);
console.log("newPhotoUrl",newPhotoUrl);
const commentsRef= admin.firestore().collection("comments");
return commentsRef.get().then(querySnapshot => {
return querySnapshot.forEach(doc => {
return admin
.firestore()
.collection("comments")
.doc(postId)
.collection("comments")
.where("userId", "==", userId)
.get()
.then(doc => {
if (doc.exists) {
doc.ref.update({avatarUrl: newPhotoUrl});
}
return console.log("The function has been run.");
});
});
});
});

Without trying it, it should be something like this:
return admin.firestore().collection("comments")
.doc(postId)
.where("userId", "==", userId)
.get()
.then(doc => {
if (doc.exists) {
doc.ref.update({avatarUrl: newPhotoUrl});
}
return console.log("The function has been run.");
});
Regardless, following Doug Stevenson's advice, you shouldn't start learning JS in Cloud Functions, as those nested loops are a bit strange and you may lack a good starting point for learning.

Query current user .once('value') in Firestore

I am transitioning a Firebase real-time database to a Firebase Firestore database but am having trouble finding the appropriate reference to query the current user.
onAuthUserListener = (next, fallback) =>
this.auth.onAuthStateChanged(authUser => {
if (authUser) {
this.user(authUser.uid)
.once('value')
.then(snapshot => {
const dbUser = snapshot.val();
// default empty roles
if (!dbUser.roles) {
dbUser.roles = [];
}
// merge auth and db user
authUser = {
uid: authUser.uid,
email: authUser.email,
emailVerified: authUser.emailVerified,
providerData: authUser.providerData,
...dbUser,
};
next(authUser);
});
} else {
fallback();
}
});
Most specifically, what would be the replacement for once('value') and snapshot.val();?
I had thought that
.onSnapshot(snapshot => {
const dbUser = snapshot.val();
...

The equivalent of once('value' in Firestore is called get(), and the equivalent of val() is data(). Calling get() returns a promise, so:
.get().then(snapshot => {
const dbUser = snapshot.data();
...
If you have a collection of users, where the profile of each user is stored within a document with their UID as its ID, you can load that with:
firebase.firestore().collection('users').doc(authUser.uid)
.get()
.then(snapshot => {
const dbUser = snapshot.val();
Note that this is pretty well covered in the documentation on getting data, so I'd recommend spending some time there and potentially taking the Cloud Firestore codelab.

snapshotChanges() streaming multiple times

The current fonction fetch documents (lobbies) in my Firestore database given name and password properties:
getLobbyByNameAndPassword(name: string, password: string): Observable<Lobby[]> {
const lobbiesRef =
this.afs.collection('lobbies', ref => ref.where('name', '==', name)).snapshotChanges().pipe(
map(actions => {
return actions.map(a => {
const data = a.payload.doc.data() as Lobby;
const id = a.payload.doc.id;
return { id, ...data };
});
}));
return lobbiesRef.pipe(
map((res) => {
return res.filter(item => item.password === password);
})
);
}
I'm using snapshotChanges() to extract the id of the documents as explained in the official git repo here. But I added pipe function because I guess it is required now with the newer version of RxJS. Then I just implement another pipe to filter the results.
The problem is when I subscribe to this Observable, it is called multiple times, non stop.
Any idea why?

stripe firebase functions to set default payment

I am trying to set the last card added to the stripe as the default via firebase functions though I can't seem to get it to work.
// Add a payment source (card) for a user by writing a stripe payment source token to Realtime database
exports.addPaymentSource = functions.database.ref('/users/{userId}/sources/{pushId}/token').onWrite(event => {
const source = event.data.val();
if (source === null) return null;
return admin.database().ref(`/users/${event.params.userId}/customer_id`).once('value').then(snapshot => {
return snapshot.val();
}).then(customer => {
return stripe.customers.createSource(customer, {source});
return stripe.customers.update(customer, {default_source: source});
}).then(response => {
return event.data.adminRef.parent.set(response);
}, error => {
return event.data.adminRef.parent.child('error').set(userFacingMessage(error)).then(() => {
// return reportError(error, {user: event.params.userId});
consolg.log(error, {user: event.params.userId});
});
});
});

You're trying to return two things in this one function. That isn't going to work. It should create the source, but it won't update it.
return stripe.customers.createSource(customer, {source});
return stripe.customers.update(customer, {default_source: source});