Delete index at array in Firestore

Question

I got this data in my document:

I want to delete index 0. How do I do this? This should do the trick I thought:

    db.collection(\"data\").         


        

Answer 1

It is not currently possible to modify individual elements of an array stored in Cloud Firestore.

If you stored the data as a map (the keys dont matter) like this:

{
  name: "sam",
  things: {
    one: "value",
    two: "value"
  }
}

Then you can delete individual elements like this:

// Delete the things.one data
db.collection("whatever").document("whatever").updateData([
    "things.one": FieldValue.delete(),
]) { err in
    if let err = err {
        print("Error updating document: \(err)")
    } else {
        print("Document successfully updated")
    }
}

Now the data will look like this:

{
  name: "sam",
  things: {
    two: "value"
  }
}

Answer 2

export const deleteArrayIndex = (collectionName, id, index) => {
    db.collection(collectionName).doc(id).update(
        { [index]: firebase.firestore.FieldValue.delete() }
    ).then(function () {
        console.log(index + "  is deleted");
    }).catch(function (error) {
        console.error("Error removing document: ", error);
    });
}

Answer 3

Array operations have finally been supported. Deletion, addition, etc. are supported via the value (not the index) now:

At the moment, there are a few bugs at the moment though as this one I encountered.

The dev blog here: