Multi post thumbnails doesn't return anything

Question

I am using the multi post thumbnails plugin. I have a custom post type "artist" who has a logo. In the loop I want to echo out the following:

$logo = MultiPostThumbnails::get_post_thumbnail_id('artist', 'Logo', $post->ID);
echo $logo;

Nothing gets returned - I used a var_dump on $logo to check, it is just an empty string. $post->ID returns the right id, and the parameters artist and Logo should be correct, too.

What am I doing wrong here?

Answer 1

First check if the post has a thumbnail:

$has_thumbnail = MultiPostThumbnails::has_post_thumbnail( 'artist', 'Logo', $post->ID );

If the post has no thumbnail, maybe you don't have attached a thumbnail to the post.

Answer 2

I have found the solution:

$logo = MultiPostThumbnails::get_the_post_thumbnail('artist', 'artist-logo', NULL, 'artist-logo');

It was clearly a matter of the right parameters. The second one has to refer to the thumbnail description in my functions.php, the third one has to be NULL, and the last one needs to be the same as the second one.

Thanks for your help!