Using WP_Query within an mu-plugin

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I’m trying to create a list of parent IDs for a custom post type for use within a “must use” plugin I’m developing on a project.

Here’s the code I’m using to generate the query:

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$cpt_parents = new WP_Query( array ( 
    'post_type' => 'cpt',
    'posts_per_page' => -1, // Get them all 
    'post_parent' => 0, // Return only top-level        
    'fields' => 'ids'
    )   
);

$parent_ids = $cpt_parents->posts;

And here are the resulting errors: 

Notice: Undefined index: wp_taxonomies in [url]/wp-includes/query.php on line 1700

Warning: Invalid argument supplied for foreach() in [url]/wp-includes/query.php on line 1700

Notice: Undefined index: wp_taxonomies in [url]/wp-includes/query.php on line 1700

Warning: Invalid argument supplied for foreach() in [url]/wp-includes/query.php on line 1700

Fatal error: Call to undefined function is_user_logged_in() in [url]/wp-includes/query.php on line 2485

What do I need to do in order to run WP_Query within a plugin?

Post Views: 3

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1 comment

  1. I figured it out. I moved the reference to WP Alchemy within a function that fires after init. Everything now works great and I can use WP_Query within the setup files.

    Here’s a code reference:

    // WP Alchemy Setup
function jd_setup_wp_alchemy() {
    include_once WPMU_PLUGIN_DIR . '/jonathanwold/metaboxes/setup.php';
    include_once WPMU_PLUGIN_DIR . '/jonathanwold/metaboxes/cpt-spec.php';
}
add_action('init', 'jd_setup_wp_alchemy');