react-native-firestore: Read document ID while creating it

Question

I'm trying to save to document ID inside a field in the same document. I'm currently doing it like this:

const myDoc = await firestore().collection("users").doc(auth().currentUser?.uid).collection("myCol").add({
  test: "Hello, World!"
});
myDoc.update({id: myDoc.id})

Is it possible to do this without having to write to the database 2 times?

Answer 1

This is stated in this documentation, for reference, see snippet below:

const myDoc = firestore().collection("users").doc(auth().currentUser?.uid).collection("myCol").doc();

await myDoc.set({
    test: "Hello, World!",
    id: myDoc.id
});

This would get the document ID that you would use when adding a document. You need to use the set() method instead of add() method.

You could also use uuid to set a custom document ID when adding it in your Firestore Database.