Append to an arary field in Firestore

Question

I\'m using Firebase and Vuejs to create an database element, which has object array inside.

That\'s how the object looks, and I want to add tasks through the form

Answer 1

You can append an item to an array using FieldValue.arrayUnion() as described in the documentation. For example:

// Atomically add a new region to the "regions" array field.
washingtonRef.update({
    regions: firebase.firestore.FieldValue.arrayUnion("greater_virginia")
});

Answer 2

The accepted answer used to be correct but is now wrong. Now there is an atomic append operation using the arrayUnion method: https://firebase.google.com/docs/firestore/manage-data/add-data#update_elements_in_an_array

This is true as long as you are using firestore and not real time db (which I assume is the case from the tags)