I have a problem.
I have two custom post type: ‘books’ and ‘authors’.
For the ‘books’ posts I had create a custom field Post Object with the ‘authors’. For each book I can choose one or more authors.
In the single book loop, the function get_field(‘authors_of_the_book’) returns a list of Object that contain all the information about the author post type.
How I can filter, in the single author page, the books for this author?