Delete a array element from a Firestore database

Question

I'm trying to delete an element from an array in a Firestore document. However, none of the approaches I tried had worked so far. My last attempt was like this:

  const ref = firestore().collection('events').doc(extraid);
  ref.get().then(document => {
    const thing = document.data();
    const rejected = thing.rejected || [];
    const interested = thing.interested || [];

    const fieldIndex = interested.findIndex(obj => obj.interestedId === sender);
    const fieldToDelete = interested[fieldIndex];
    firebase.firestore.FieldValue(fieldToDelete);
    firebase.firestore.FieldValue.delete(fieldToDelete);
  });

How can I delete an element from an array in a Firestore document?

Doug Stevenson · Accepted Answer · 2020-06-11 17:37:29Z

1

You will have to update() the modified array field back to the document as suggested by the documentation. Calling FieldValue.delete() isn't enough - that just creates a FieldValue token that you can pass to update() to make the change. It will look something like this:

ref.update('interested', FieldValue.delete(fieldToDelete))

answered Jun 11, 2020 at 17:37

Doug Stevenson

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