acf Post Object id code example

Example 1: acf post object

<?php

// DISPLAY CONTENT FOR SINGLE POST OBJECT

$post_object = get_field('post_object');

if( $post_object ): 

	// override $post
	$post = $post_object;
	setup_postdata( $post ); 

	?>
    <div>
    	<h3><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></h3>
    	<span>Post Object Custom Field: <?php the_field('field_name'); ?></span>
    </div>
    <?php wp_reset_postdata(); // IMPORTANT - reset the $post object so the rest of the page works correctly ?>
<?php endif; ?>

Example 2: acf post object

<?php

// DISPLAY DATA FOR MULTIPLE POST OBJECTS

/*
*  Loop through post objects (assuming this is a multi-select field) ( setup postdata )
*  Using this method, you can use all the normal WP functions as the $post object is temporarily initialized within the loop
*  Read more: http://codex.wordpress.org/Template_Tags/get_posts#Reset_after_Postlists_with_offset
*/

$post_objects = get_field('post_objects');

if( $post_objects ): ?>
    <ul>
    <?php foreach( $post_objects as $post): // variable must be called $post (IMPORTANT) ?>
        <?php setup_postdata($post); ?>
        <li>
            <a href="<?php the_permalink(); ?>"><?php the_title(); ?></a>
            <span>Post Object Custom Field: <?php the_field('field_name'); ?></span>
        </li>
    <?php endforeach; ?>
    </ul>
    <?php wp_reset_postdata(); // IMPORTANT - reset the $post object so the rest of the page works correctly ?>
<?php endif;

/*
*  Loop through post objects (assuming this is a multi-select field) ( don't setup postdata )
*  Using this method, the $post object is never changed so all functions need a seccond parameter of the post ID in question.
*/

$post_objects = get_field('post_objects');

if( $post_objects ): ?>
    <ul>
    <?php foreach( $post_objects as $post_object): ?>
        <li>
            <a href="<?php echo get_permalink($post_object->ID); ?>"><?php echo get_the_title($post_object->ID); ?></a>
            <span>Post Object Custom Field: <?php the_field('field_name', $post_object->ID); ?></span>
        </li>
    <?php endforeach; ?>
    </ul>
<?php endif;

?>