How to create and push an object in to firebase array?

Question

My current logic is the following creating adding a document with a user id in to users collection, and push the first object, then on the second call I want to be able to update the excising array with a new object.

const docRef = doc(db, 'user', _authContext.currentUser.uid);
const payload = { items: [{item1 : 1}] };
await setDoc(docRef, payload);


// New array after update (second call of the function)
items: [{item1 : 1}, {item2 : 2}]

Frank van Puffelen · Accepted Answer · 2022-02-20 05:09:02Z

1

I think you're looking for:

await updateDoc(docRef, { items: arrayUnion({ item2: 2 }) });

Also see the Firebase documentation on adding items to an array.

answered Feb 20, 2022 at 5:09

Frank van Puffelen

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3 Comments

Richardson Over a year ago

would it work ,if the doc is not there to begin with ?

Richardson Over a year ago

I want to be able to create on the fly since the array will be dependent on a user, and I could have 1000 , for example, since I don't have access to the document id before creating the document and I want to related to users form authentication

Frank van Puffelen Over a year ago

If the doc may not exist yet, you'll need to use setDoc and provide merge options.

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