Related posts

Continuing from the Basic usage tutorial, let's say that when viewing a single post, you don't want to show the connected page, but other posts connected to the same page.

First, you will have to create a function in your functions.php theme file:

0.8

<?php
function get_related_posts( $post_id ) {
	// Get the page connected to the post
	$related_pages = get_posts( array(
		'post_type' => 'page',
		'connected_from' => $post_id,
		'posts_per_page' => 1,
		'suppress_filters' => false
	) );

	// No related posts if there's no page connecting them
	if ( empty( $related_pages ) )
		return array();

	// Get the other posts connected to the same page, except the current post
	return get_posts( array(
		'post_type' => 'post',
		'post__not_in' => array( $post_id ),
		'connected_to' => $related_pages[0]->ID,
		'nopaging' => true,
		'suppress_filters' => false
	) );
}

0.9-alpha3

<?php
function get_related_posts( $post_id ) {
	global $my_connection_type;

	// Get the page connected to the post
	$related_pages = $my_connection_type->get_connected( $post_id );

	// No related posts if there's no page connecting them
	if ( !$related_pages->have_posts() )
		return array();

	// Get the id of the first page
	$page_id = $related_pages->posts[0]->ID;

	// Get the other posts connected to the same page, except the current post
	return $my_connection_type->get_connected( $page_id, array(
		'post__not_in' => array( $post_id ),
	) );
}

It takes a post id and returns an array of related posts.

Now that we have the logic for finding related posts, all we need to do is display them:

<?php p2p_list_posts( get_related_posts( get_queried_object_id() ) ); ?>

The above code would go in single.php