Ahh, youre starting to get under the hood Jason.

This is a great thing.

Take a look at the parts/fields folder.
Take the post-relate.php and the select.php and see if you can’t make a new field called post-relate-select.php and make your own brand new field type.

🙂

Once you’ve got field creation down, you’ll be amazed at the things you can do with piklist.

Marcus

How can I change this to a custom post type as the scope instead? I tried setting $scope = “‘my_cpt'”; didn’t work, options go blank.

I changed the value for post_type < get_posts < choices < field, still yields blank. What else do I need to change? Also how do I add a null default option?

I’m groggy right now but this is what I have so far for meta-boxes/product.php, which I threw together from some code found on these forums mixed with my own inferred:

<?php
/*
Title: Supplier
Post Type: product
Context: side
*/

piklist('field', array(
    'type' => 'post-relate'
	,'field' => 'Supplier'
    ,'scope' => 'product_supplier'
	,'field' => 'prod_supplier'
  ));

/*
$relate = get_posts(array(
    'post_type' => 'product_supplier' // Set post type you are relating to.
    ,'posts_per_page' => -1
//    ,'post_belongs' => $post->ID
    ,'post_status' => 'publish'
    ,'suppress_filters' => false // This must be set to false
  ));

foreach ($relate as $related):
  echo $related->post_title;
endforeach;
*/

//$scope = "'product_supplier'";

	$posts = get_posts(array(
		'post_type'			=> $scope,
		'post_belongs'		=> $post->ID,
		'post_per_page'	=> -1,
		'suppress_filters'=> false
	));

	$default = get_post_meta( $post->ID, $field, true );
	$default = empty($default) ? null : $default;

	piklist('field', array(
		'type'		=> 'select',
		'scope'		=> 'relate',
		'field'		=> $scope . '_select_post_id',
		'template'	=> 'field',
		'value'		=> $default,
		'choices'	=> piklist(
			get_posts(array(
				'post_type'		=> 'product_supplier',//$scope,
				'numberposts'	=> -1,
				'orderby'		=> 'title',
				'order'			=> 'ASC'
			)),
			array('ID', 'post_title')
		),
		'attributes'	=> array(
			'class' => $scope . '_select_post_id'
		)
	));

	piklist('field', array(
		'type'	=> 'hidden',
		'field'	=> $field,
		'value'	=> $default,
		'attributes' => array(
			'class'	=> $field . '_select_id'
		)
	));

	piklist('field', array(
		'type'	=> 'hidden',
		'scope'	=>	'relate',
		'field'	=> $scope . '_select_relate',
		'value'	=> 'has'
	));

	piklist('field', array(
		'type'	=> 'hidden',
		'scope'	=>	'relate',
		'field'	=> $scope . '_select_relate_remove',
		'attributes'	=> array(
			'class' => $scope . '_select_relate_remove'	
		)
	));
  
  wp_reset_postdata();
?>

<script type="text/javascript">

	(function($) {

		$(document).ready(function() {

			var
				$select = $('.<?php echo $scope . '_select_post_id'; ?>'),
				initialValue = <?php echo ( $default) ? $default : -1 ; ?>;

			$select.change(function(event) {
				event.stopPropagation();

				var
					$remove = $('.<?php echo $scope . '_select_relate_remove'; ?>'),
					$hiddenID = $('.<?php echo $field . '_select_id'; ?>'),
					currentValue = $(this).val(),
					ids = [];

				if ( currentValue != initialValue ) {
					$(this).children('option').each(function() {
						var value = $(this).val();

						if (value !== currentValue)
							ids.push($(this).val());
					});
				}
				$hiddenID.val(currentValue);
				$remove.val(ids.join(','));
			});

		});

	})(jQuery);
</script>

That only displays the default option, not the suppliers also 🙁

That’s what’s happening, using the latest version.