Firebase 9 - How to do new doc ref

Question

Hello guys i've been trying to convert this code into modular firebase 9:

fb8: const userRef = db.collection('Users').doc();

to fb9: const userRef = doc(db, 'Users');

But i'm getting this error: FirebaseError: Invalid document reference. Document references must have an even number of segments, but Users has 1.

Please help!

Answer 1

The doc() method is equivalent to .collection('users').doc('docID') where you need to specify the ID. If you are trying to add a document with random ID then you add use addDoc() with collection() as shown below:

const usersCol = collection(db, 'Users')

await addDoc(usersCol, {...data})

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If you want the random ID before adding the document then you can try this:

const userRef = doc(collection(db, 'Users'));
console.log(userRef.id)

Document references must have an even number of segments, but Users has 1.

You can checkout this answer for explanation of doc() and collection():

Firestore: What's the pattern for adding new data in Web v9?

Answer 2

Expanding @Dharmaraj answer:

• Get a docRef with a random id
• Use the id before the document creation, for example, insert the id in the document data
• Then create the document

const usersRef = collection(db,'users') // collectionRef
const userRef = doc(usersRef) // docRef
const id = userRef.id // a docRef has an id property
const userData = {id, ...} // insert the id among the data
await setDoc(userRef,userData) // create the document