How to set lifetime for posts with a specific field?

Question

JavaScript

Good day, there is a scheme of posts where there is a field inTrash: Boolean.
And there is such a mongo feature docs.mongodb.org/manual/tutorial/expire-data
How to apply it not for all posts from the collection, but only for posts with the 'inTrash':true field (it will be set by the moderator. )?

Answer 1

Here , I put it.