add/update array in collection with firestore and react native

Question

Im trying to add an object in the array "steps" from collection task, without delete the objects that already inside the array

                
queryDocumentSnapshot.ref.set({steps:[{title:newStep,completed:false}]});
alert('This task has been updated');

But when I use set, its deleted all the old fields.. Hoe can I update (add new element in the array) without delete..?

Renaud Tarnec · Accepted Answer · 2021-04-17 17:28:32Z

1

As explained in the doc, you need to use arrayUnion:

queryDocumentSnapshot.ref.update({
    steps: firebase.firestore.FieldValue.arrayUnion({title:newStep,completed:false})
})
.then(() => {
   alert('This task has been updated');
});

answered Apr 17, 2021 at 17:28

Renaud Tarnec

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