Append to an arary field in Firestore

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

That’s how the field looks, and I want to add tasks through the form into the ‘moreTasks’ as an array.

I tried using this, but it just creates new entity in the database.

db.collection('Tasks').add({
    tasker: this.tasker.taskerName
})

I also tried checking API but I couldnt understand the refs, because I was using different methods to achieve that goal.

creatTask() {
  db.collection('Tasks').add({
    task_id: this.task_id,
    name: this.name,

What would be correct way to approach this problem?

Answer

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")
});