Is it possible to set a field in the last element in an array?

[steevej (Steeve Juneau)]

Hi @Omer_Toraman1, in case you did not see it, there is a similar thread as yours going on. See Appending item to a list nested within another list.

The following is an interesting idea:

@Francesco_Garrisi

In any case, I was thinking: would it be possible to exploit some reverse operator on “testHistory” so that we can match the first elements of the reversed list?

Rather than having to update the last element of the array, you update the first. And this is quite easy to do with the dot notation because you can update with
set : { "chat.0.answer" : ... }

This could be even better than

@steevej

rather that updating the last element of an array you update a current object. Once the current objet is completed you push it into the array.

With the reversed array the current incomplete object is the first one of array. I like it.