Make Next and Previous on single-$posttype.php use the same order as archive-$posttype.php

Question

I have a custom post type events and am displaying these events using archive-events.php and single-events.php from the template hierarchy. I have a custom query in archive-events.php

$paged = ( get_query_var('paged') ) ? get_query_var('paged') : 1;
$events_query = new WP_Query( array (
  'post_type' => 'events',
  'orderby' => 'meta_value',
  'meta_key' => '_fulldate',
  'order' => 'ASC',
  'paged' => $paged,
  'meta_query' => array ( array(
      'key' => '_fulldate',
      'value' => $cutoff_date,
      'type' => 'numeric',
      'compare' => '>' ) ) )
);

This displays the events in order of event date ( as opposed to published date ). All works fine until I put previous_post_link() and next_post_link() into single-events.php. What happens then is that the next and previous links take me to the next and previous event by published date as opposed to by event date.

I am a bit confused about how events-single.php is meant to know which is the next event. Should I be doing some kind of query on there as well, because I'm not at the moment? It's just a standard 'single' file.

Could anybody help me out I have been up and down this and cant find out how to do it.

Answer 1

You probably need a filter on get_{$adjacent}_post_join and get_{$adjacent}_post_sort to get those to work.

Apologies, but I don't have time right now to work up the actual filters and debug them, but maybe that will get you started.