firebase firestore v9 中的访问子集合

Question

I'm trying to access the firebase firestore documents inside subcollection (messages):

user > user.uid > messages > docRef.id > date: Date.now()
                                         text: userText
                  userEmail: user.email
                  userName: display.name

I used the following:

const snapRef2 = collection(db, "users/" + user.uid + "/messages")
onSnapshot(snapRef2, (snapshot) => {
    snapshot.forEach((doc) => {
        console.log(doc.data());
    })
})

But this method works only when user.uid is a string like: const snapRef2 = collection(db, "users/randomstring/messages")

How do I access the documents inside messages?

Answer 1

const snapRef2 = collection(db, `users/${user.uid}/messages`) 

Make sure to use back ticks instead of quotation marks

Answer 2

The code in your answer works if you want to retrieve the messages for a specific user, identified by user.uid .

If you want to get the messages for all users, you can use a collection group query . Such a query reads from all collections with a specific name, like messages :

const snapRef2 = collectionGroup(db, "/messages")
...

The rest of your code can stay the same.