Add ACF Post Object field to Wordpress admin column

schrdr :

I have a custom post type for books that has two ACF fields, book_title and book_author. I have a separate custom post type for passages from the book, which pulls in a book, as an ACF post object, into two fields in the passages custom post type with the same field names.

I would like to be able to display the book_title and book_author fields as columns in the passages custom post type list. I am currently able to pull in the title of the book, but thats only because I am grabbing the title of the post, not the actual book_title field from the post. Is there a way to grab fields from a post object like this and set them as columns?

Here is my current code from my passages custom post type file:

function add_acf_columns($columns)
{
    return array_merge($columns, array(
        'book_title' => __('Book Title') ,
        'book_author' => __('Book Author')
    ));
}
add_filter('manage_passages_posts_columns', 'add_acf_columns');


function passages_custom_column($column, $post_id)
{
    switch ($column)
    {
        case 'book_title':
            echo get_the_title(get_field('book_title', $post_id));
        break;
        case 'book_author':
            echo get_post_meta($post_id, 'book_author', true);
        break;
    }
}
add_action('manage_passages_posts_custom_column', 'passages_custom_column', 10, 2);

schrdr :

I solved this by modifying Xhynk's answer.

After you grab the ID of the Book post object in the Passages post book field, you can use ACF's get_field() to grab the title and author values from the Book post itself, and then pass those values into the columns.

// add columns to passages list
add_filter('manage_passages_posts_columns', 'add_acf_columns');
function add_acf_columns($columns)
{
    return array_merge($columns, array(
        'book_title' => __('Book Title') ,
        'book_author' => __('Book Author')
    ));
}

// add title and author to passages list columns
add_action('manage_passages_posts_custom_column', 'passages_custom_column', 10, 2);
function passages_custom_column($column, $post_id) {
    switch( $column ){
        case 'book_title':
            $book_object = get_field( 'book', $post_id );
            $book_title = get_field('title', $book_object->ID);
            echo ($book_title) ? $book_title : '';
            break;
        case 'book_author':
            $book_object = get_field( 'book', $post_id );
            $book_author = get_field('author', $book_object->ID);
            echo ($book_author) ? $book_author : '';
            break;
    }
}