[wp-trac] [WordPress Trac] #14568: adjacent_posts_rel_link_wp_head causes meta to be updated multiple times

Mon Aug 9 09:23:26 UTC 2010

#14568: adjacent_posts_rel_link_wp_head causes meta to be updated multiple times
--------------------------+-------------------------------------------------
 Reporter:  greenshady    |       Owner:                 
     Type:  defect (bug)  |      Status:  new            
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  General       |     Version:  3.0.1          
 Severity:  normal        |    Keywords:                 
--------------------------+-------------------------------------------------
 I wasn't exactly sure what to title this ticket as I'm not certain *what*
 causes the issue.  But, I can tell you how I found it and the solution I'm
 currently using to fix it.  Maybe someone can help me track it down.

 I was writing a post views function that tracks the number of times single
 posts have been viewed using the post meta functions.  Here's a loook at
 it:

 {{{
 add_action( 'template_redirect', 'entry_views_update' ); // Tried many
 different hooks

 function entry_views_update() {
         global $wp_query;

         if ( is_singular() ) {
                 $post_id = $wp_query->get_queried_object_id();

                 $old_views = get_post_meta( $post_id, 'Views', true );

                 $new_views = absint( $old_views ) + 1;

                 update_post_meta( $post_id, 'Views', $new_views,
 $old_views );
         }
 }
 }}}

 This works great for the post being viewed.  But, the problem is that the
 next post (one published after it) also gets an updated view count.  So,
 two posts are getting their meta updated when only the current post meta
 should be updated.

 I ran across two other topics where others had the same issue (there may
 be more):
  * http://wordpress.org/support/topic/problem-with-add_filter-while-
 developing-a-plugin
  * http://wordpress.org/support/topic/assistance-with-update_post_meta-
 issue

 The only solution that seems to work is adding this:

 {{{
 remove_action( 'wp_head', 'adjacent_posts_rel_link_wp_head', 10 );
 }}}

 This removes the next/prev posts from the `<head>` area, which is not
 desirable.

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Ticket URL: <http://core.trac.wordpress.org/ticket/14568>
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