Why is querying posts messing up my pages?

Question

I am working on a theme at the moment and I have set up a post template.

This post template is linked to some custom post types.

When I query_posts for my post type on the actual post template itself it makes the content disappear for some reason? Is there something I am missing here?

Thanks, Mark

My loop is as follows:

<?php
    $query = 'posts_per_page=10&post_type=articles';
    $queryObject = new WP_Query($query);

    // The Loop...
    if ($queryObject->have_posts()) {
        while ($queryObject->have_posts()) {
            $queryObject->the_post(); the_title(); the_content();
        }
    }
?>

Answer 1

use wp_reset_query after your loop to restore the global post data for the main loop.

Answer 2

For the sake of completeness, while using wp_reset_query() isn't necessarily wrong, it is an unnecesary extra operation, if run after a secondary query with a new instance of the WP_Query class. The $wp_query object isn't altered, so it needs not be reset. Only the $post global requires a reset. Hence, wp_reset_postdata() would be sufficient in this case.

See /wp-includes/query.php for reference:

/**
* Destroy the previous query and set up a new query.
*
* This should be used after {@link query_posts()} and before another {@link
* query_posts()}. This will remove obscure bugs that occur when the previous
* wp_query object is not destroyed properly before another is set up.
*
* @since 2.3.0
* @uses $wp_query
*/
function wp_reset_query() {
    unset($GLOBALS['wp_query']);
    $GLOBALS['wp_query'] = $GLOBALS['wp_the_query'];
    wp_reset_postdata();
}

/**
* After looping through a separate query, this function restores
* the $post global to the current post in the main query
*
* @since 3.0.0
* @uses $wp_query
*/
function wp_reset_postdata() {
    global $wp_query;
    if ( !empty($wp_query->post) ) {
        $GLOBALS['post'] = $wp_query->post;
        setup_postdata($wp_query->post);
    }
}