How can i count the post added in relationship field, theme display

Question

How can i count the post added in relationship field. The relationship field is a plugin (http://www.advancedcustomfields.com/docs/field-types/relationship/)

In my admin i have a MetaBox i create to link the post from another post type to my posts. please see picture below in the link

http://i.imgur.com/PFFY8.jpg

Subtitle and Trailers

How can i get the number of post attach to the relationship field.

Ex: If the relationship field has 4 articles added in site in tabs i want to be able to get the number of articles

Ex: Trailers(1) - that are display in Front-end.

Something like this ( cinemagia.ro/filme/avatar-2-578279/ )

To retrive the post and display into my theme i use

<?php if(get_field('trailere_filme') != ""){foreach(get_field('trailere_filme') as $post_object): ?>        
<div class="box-trailere">
<div class="trailer-img">
<a href="<?php echo get_permalink($post_object->ID); ?>" rel="bookmark" title="<?php printf(__('Trailer film %s', 'kubrick'), the_title_attribute('echo=0')); ?>">
<span class="tip"><?php echo get_field( 'tip', $post_object->ID ); ?></span>
<span class="trai-hov"></span>
<img src="http://img.youtube.com/vi/<?php echo get_field( 'trailer', $post_object->ID ); ?>/<?php echo get_field( 'img_trailer', $post_object->ID ); ?>" alt="Trailer <?php echo get_the_title($post_object->ID) ?>" title="Trailer <?php echo get_the_title($post_object->ID) ?>"></a>
<span class="duration"><?php echo get_field( 'time', $post_object->ID ); ?></span>
</div>
<span class="trailer-title"><a href="<?php echo get_permalink($post_object->ID); ?>" title="Trailer <?php echo get_the_title($post_object->ID) ?>"><?php echo get_the_title($post_object->ID) ?></a></span>
</div>   
<?php endforeach;}else{?>
<div class="no-trailer">Acest film nu are trailer.</div>
<?php } ?>

And for tags related to post

in my hteme i use:

<?php
$orig_post = $post;
        global $post;
        $tags = wp_get_post_tags($post->ID);

        if ($tags) {
            $tag_ids = array();
            foreach($tags as $individual_tag) $tag_ids[] = $individual_tag->term_id;
            $args=array(
                'tag__in' => $tag_ids,
                'post__not_in' => array($post->ID),
                'post_type'=> 'stiri',
                'posts_per_page'=>1, // Number of related videos that will be shown.
                'caller_get_posts'=>1

            );}
$recentPosts = new WP_Query($args);
?>
<?php while ($recentPosts->have_posts()) : $recentPosts->the_post(); ?>
<div class="sidebar-titlu"><a href="<?php the_permalink() ?>" rel="bookmark"><?php the_title(); ?></a></div>
<div class="sidebar-stiri">
<img src="/scripts/timthumb.php?src=<?php the_field('imagine_stire'); ?>&h=60&w=90&zc=1" alt="" title="<?php the_title(); ?>" />
<?php $excerpt = get_the_excerpt();echo string_limit_words($excerpt,30);?><a class="detalii" href="<?php the_permalink() ?>" rel="bookmark" title="<?php printf(__('Permanent Link to %s', 'kubrick'), the_title_attribute('echo=0')); ?>">...detalii</a>
</div>
</div>
<?php endwhile; ?>

Thanks

Answer 1

The relationship field will return an array of post objects, so just count them:

$related_posts = get_field( 'trailere_filme' );
echo count( $related_posts );