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WP Query Orderby Taxonomy Term Name
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add_filter('posts_clauses', 'posts_clauses_with_tax', 10, 2); | |
function posts_clauses_with_tax( $clauses, $wp_query ) { | |
global $wpdb; | |
//array of sortable taxonomies | |
$taxonomies = array('example-taxonomy', 'other-taxonomy'); | |
if (isset($wp_query->query['orderby']) && in_array($wp_query->query['orderby'], $taxonomies)) { | |
$clauses['join'] .= " | |
LEFT OUTER JOIN {$wpdb->term_relationships} AS rel2 ON {$wpdb->posts}.ID = rel2.object_id | |
LEFT OUTER JOIN {$wpdb->term_taxonomy} AS tax2 ON rel2.term_taxonomy_id = tax2.term_taxonomy_id | |
LEFT OUTER JOIN {$wpdb->terms} USING (term_id) | |
"; | |
$clauses['where'] .= " AND (taxonomy = '{$wp_query->query['orderby']}' OR taxonomy IS NULL)"; | |
$clauses['groupby'] = "rel2.object_id"; | |
$clauses['orderby'] = "GROUP_CONCAT({$wpdb->terms}.name ORDER BY name ASC) "; | |
$clauses['orderby'] .= ( 'ASC' == strtoupper( $wp_query->get('order') ) ) ? 'ASC' : 'DESC'; | |
} | |
return $clauses; | |
} |
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