[Plugin: Posts 2 Posts] Hwo to make Grandfather > Father > Son

See https://github.com/scribu/wp-posts-to-posts/wiki/Reciprocal-connections

Thank You for fast response ??

How can I get different fields in relation from, and to?

p2p_register_connection_type( array(

			'name' => 'family_relationship',
			'from' => 'person',
			'to' => 'person',
			'reciprocal' => false,
			'cardinality' => 'one-to-many',
			'title' => array(
 'from' => 'He is a descendant',
 'to' => 'It has a descendant' ),
			'fields' => array( 'family-relationships' => array(
'title_to' => 'Type of relationship to the ancestor',
'values_to' => array( 'son', 'grandson' ),
'title_from' => 'Type of relationship to the descendant',
'values_from' => array( 'father', 'grandfather' ),
															)
							)
 		) );

Hi, I managed to get something like this to work with the following:

p2p_register_connection_type( array(
		'name' => 'parent_child',
		'from' => 'person',
		'to' => 'person',
		'reciprocal' => false,
		'title' => array(
			'from' => 'Parents',
			'to' => 'Children'
			)
		)
	);

This will create a connection between only parents and children, but by filling out each link in the chain you allow grandchildren, grand-grand-children, grand-grand-grand-children… and so on. You can then walk through these connections when displaying them. E.g you could put something like this in single.php:

//get parents and children
$children = p2p_type('parent_child')->set_direction('to')->get_connected( $post );
$parents = p2p_type('parent_child')->get_connected( $post );

if( $parents->have_posts() ):
	echo 'Parents';
	p2p_list_posts($parents);
endif;

if( $children->have_posts() ):
	echo 'Children and grandchildren:';
	if( $children->have_posts() ):
		foreach( $children->posts as $child ):
			$permalink = get_permalink( $child );
			$name = get_the_title( $child );

			echo "<li><a href='$permalink'>$name</a>";

			// get grandchildren for this child
			$grandchildren = p2p_type('parent_child')->set_direction('to')->get_connected( $child );

			// display grandchildren
			if( $grandchildren->have_posts() ):
				p2p_list_posts($grandchildren);
			endif;

			echo "</li>";

		endforeach;
	endif;
endif;

You could keep looping through children for as many times as you like, although there should be a more efficient way.

I tried to get something like that to work with each_connected(), but couldn’t get it to work.

How can I get different fields in relation from, and to?

I’m afraid that’s not something the API allows.

The only workaround would be to hide the fields you don’t want, depending on which side you’re viewing.