Question

The query below runs a featured carousel on my site. I want the carousel to only display post that contain an image. I’ve searched everywhere and cannot find a solution. Please help!

query_posts(array('post_type' => 'ad_listing', 'post_status' => 'publish', 'orderby' => 'rand'));

Answer 1

I ran into this same thing while developing my own theme.
This is how I solved it.

Start by adding the featured image capability in your functions.php.

if (function_exists('add_theme_support')) {
    add_theme_support('post-thumbnails');
}

This allows you to select a featured image for each post.

With the featured image function available you can use the following function to detect if a post has a featured image…in loop form:

$args = array(
'post_type' => 'ad_listing'
);
query_posts($args);
if ( have_posts() ) : 
    while ( have_posts() ) : the_post();
        if ( has_post_thumbnail() ) { //For featured images
            //For post images/attachments
                ob_start();
                the_id(); 
                $postID = ob_get_clean(); 
                $args = array(
                    'numberposts' => 1,
                    'order'=> 'ASC',
                    'post_mime_type' => 'image',
                    'post_parent' => $postID,
                    'post_status' => null,
                    'post_type' => 'attachment'
                );
                $images =& get_children($args);

                if ( empty($images) ) {
                    //What to do without images
                }
                else {
                    //What to do with images
                }
        }
    endwhile;
else :
    //What happens when no posts are found
endif;

Hope this helps.