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My WP_query in the header menu fails to pull any posts on tag and category pages only. Error occurs even with the Loop removed from those template pages.

The menu in the header lists the parents. Then for each parent, it then queries for their child posts and image. Interestingly, (ALL) the posts appear when 'post_parent' condition is removed from $group_nav.

I'm relatively new to php so any help is much appreciated. This issue has been giving me grief for the last 3 days!

drop-down menu canbe viewed here: http://d1079691-5522.myweb.westnethosting.com.au/wsp-ie.com.au/?industry=construction

and mis-behaving here: http://d1079691-5522.myweb.westnethosting.com.au/wsp-ie.com.au/?tag=synthetic-leather

Coding in header.php

<?php $temp_query = clone $wp_query; ?>

<?php $group_nav_ids = array(916,917,918,919,920,921); //custom post type parent ids
foreach ($group_nav_ids as $group_nav_id): ?>              

*do stuff       

<?php $group_nav = new WP_Query(array( //get children posts
'post_type'         => 'pgroup',
'post_parent'       => $group_nav_id,                               
'order'             => 'ASC',
'orderby'           => 'menu_order',
'posts_per_page'    => -1
));

if ($group_nav->have_posts()) : ?>       
<?php while ($group_nav->have_posts()) : $group_nav->the_post(); ?>

*do stuff

<?php endwhile; ?>
<?php endif; ?>
<?php endforeach; ?>

<?php wp_reset_query(); wp_reset_postdata(); rewind_posts(); ?>

<?php $wp_query = clone $temp_query; ?>
  • the first and last lines are completely pointless, they should be removed. also, you only need wp_reset_postdata() after a custom loop, wp_reset_query() and rewind_posts() can be removed. – Milo May 30 '13 at 3:11
  • Hi Milo. Thanks for the tip. Code is tidier, however original issue remains. – user33445 May 30 '13 at 3:39
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Just in case anyone happens to run into this same problem, my round-about solution for taxonomy template query conflict:

  1. clone the main query
  2. NULL the query
  3. define new WP_Query
  4. re-instate cloned query

Tested and working in header.php

<?php       
global $wp_query; 
$temp_query = clone $wp_query;
global $post; 
$temp_post = clone $post;
$wp_query = NULL; 

$wp_query = new WP_Query( $args ); 
// THE LOOP

wp_reset_postdata(); 
$wp_query = clone $temp_query; 
$post = clone $temp_post;
?>
  • It makes no sense that this would work while a completely custom WP_Query would not. I assume your issue was elsewhere and this "accidentally" fixed it. I wouldn't recommend anyone handle queries this way, it's quite messy. – Milo May 30 '13 at 16:45

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