public function process_actions()
 {
     if ('delete' === $this->current_action()) {
         // In our file that handles the request, verify the nonce.
         $nonce = esc_attr($_REQUEST['_wpnonce']);
         if (!wp_verify_nonce($nonce, self::$nonce)) {
             die('Nonce check failed.');
         }
         Evaluate_Manager::delete_metric(absint($_GET['metric_id']));
         wp_redirect(add_query_arg());
         exit;
     }
     if (isset($_POST['action']) && $_POST['action'] == 'bulk-delete' || isset($_POST['action2']) && $_POST['action2'] == 'bulk-delete') {
         $delete_ids = esc_sql($_POST['bulk-delete']);
         // loop over the array of record IDs and delete them
         foreach ($delete_ids as $metric_id) {
             Evaluate_Manager::delete_metric($metric_id);
         }
         wp_redirect(add_query_arg());
         exit;
     }
 }
            return;
        }
        global $wpdb;
        // TODO: Verify nonce.
        $metric_type = Evaluate_Metrics::get_metric_types()[$_POST['type']];
        $options = $metric_type->filter_options($_POST['options']);
        $data = array('name' => sanitize_text_field($_POST['name']), 'type' => sanitize_text_field($_POST['type']), 'options' => serialize($options));
        if (empty($_POST['metric_id'])) {
            $data['created'] = current_time('mysql', 1);
            $wpdb->insert(Evaluate::$metric_table, $data);
            $metric_id = $wpdb->insert_id;
        } else {
            $wpdb->update(Evaluate::$metric_table, $data, array('metric_id' => $_POST['metric_id']));
            $metric_id = $_POST['metric_id'];
        }
        wp_redirect(add_query_arg('metric_id', $metric_id));
        exit;
    }
    public static function delete_metric($metric_id)
    {
        global $wpdb;
        $wpdb->delete(Evaluate::$metric_table, array('metric_id' => $metric_id), array('%d'));
    }
    public static function get_metrics_count()
    {
        global $wpdb;
        return $wpdb->get_var("SELECT COUNT(*) FROM " . Evaluate::$metric_table);
    }
}
Evaluate_Manager::init();