WooCommerce Custom WP_Query Solution for an error while getting order details

This article aims to resolve 500 error issues encountered when using WP_Query to customize query WooCommerce order details. By analyzing the problem code, providing fixed code examples, and explaining the code logic and precautions in detail, helping developers to correctly use WP_Query to obtain and display WooCommerce order data, and implementing functions such as paging loading. This article also provides optimized code examples to make it easier to understand and maintain.

There are often problems when using WP_Query to get WooCommerce order details, especially when it comes to AJAX calls and paging capabilities. A 500 error occurs usually because an incorrect variable or method is used inside the loop to get order information. The following details on how to use WP_Query correctly to get WooCommerce order details and provide a viable solution.

Problem analysis

There are several problems in the original code:

1. Incorrect Order ID Getting method: Getting the Order ID with $loop->post->ID is incorrect in the WP_Query loop. The get_the_ID() function should be used.
2. Repeat query: Two WP_Query instances are used in the code, one for looping and the other for counting. This can lead to unnecessary performance overhead.
3. Paging logic is complex: paging logic can be simplified, and paging can be more conveniently implemented using WP_Query's paged parameter.
4. Poor code readability: The code structure can be optimized to make it easier to understand and maintain.

Solution

Here is a fixed code example that solves the above problem and provides a clearer way to implement it:

functions.php

 <?php add_action( &#39;wp_ajax_demo_pagination_posts&#39;, &#39;demo_pagination_posts&#39; );
add_action( &#39;wp_ajax_nopriv_demo_pagination_posts&#39;, &#39;demo_pagination_posts&#39; );

function demo_pagination_posts() {
    global $wpdb;

    if ( isset( $_POST[&#39;page&#39;] ) ) {
        // Sanitize and validate the page number
        $page = max( intval( $_POST[&#39;page&#39;] ), 1 );
        $per_page = 4; // Number of orders per page

        // WP_Query to retrieve shop orders with pagination
        $args = array(
            &#39;post_type&#39; => 'shop_order',
            'post_status' => 'wc-completed',
            'orderby' => 'post_date',
            'order' => 'DESC',
            'posts_per_page' => $per_page,
            'paged' => $page, // Use the 'paged' parameter for pagination
        );

        $loop = new WP_Query( $args );
        $count = $loop->found_posts; // Total number of posts found

        $msg = '';

        if ( $loop->have_posts() ) {
            while ( $loop->have_posts() ) {
                $loop->the_post();

                // Get the order ID
                $order_id = get_the_ID();

                // Get an instance of the WC_Order Object
                $order = wc_get_order( $order_id );

                if ( $order ) {
                    $items = $order->get_items();
                    $orders_id = $order->get_id();
                    $status = wc_get_order_status_name( $order->get_status() );
                    $date_created = $order->get_date_created()->date( 'd/m/Y' );
                    $payment_method = $order->get_payment_method_title();
                    $order_total = $order->get_formatted_order_total();

                    foreach ( $items as $item ) {
                        $product_name = $item->get_name();
                        $view_order = $order->get_view_order_url();
                        $product = $item->get_product();

                        if ( $product instanceof WC_Product ) {
                            $order_img = $product->get_image();
                            $downloads = $order->get_downloadable_items();
                            $download_button = '';

                            if ( is_array( $downloads ) ) {
                                foreach ( $downloads as $product ) {
                                    $download_button = '<a href="'%20.%20%24product%5B'download_url'%5D%20.%20'" target="_blank">Download</a>';
                                }
                            }

                            $msg .= '
                                

Ordine #' . esc_attr( $orders_id ) . '

Prodotto ' . wp_kses_post( $product_name ) . '

Data ' . wp_kses_post( $date_created ) . '

Prezzo ' . wp_kses_post( $order_total ) . '

Stato ' . wp_kses_post( $status ) . '

File Visualizza

'; } } } } } // Pagination logic $pages_num = intval( ceil( $count / $per_page ) ); $is_last_page = $pages_num == $page; $is_first_page = $page === 1; $pagination_html = ""; echo ''; echo ''; wp_reset_postdata(); // Reset the global post data } die(); }

custom-template.php

 <div class="wrap">
    <div id="primary" class="content-area">
        <div class="col-md-12 content">
            <div class="inner-box content no-right-margin darkviolet">
                <script type="text/javascript">
                    jQuery(document).ready(function ($) {
                        // This is required for AJAX to work on our page
                        var ajaxurl = &#39;<?php echo admin_url( &#39;admin-ajax.php&#39; ); ?>&#39;;

                        function load_all_posts(page) {
                            var data = {
                                page: page,
                                action: "demo_pagination_posts"
                            };

                            $.post(ajaxurl, data, function (response) {
                                $(".pagination_container").html(response);
                            });
                        }

                        load_all_posts(1); // Load page 1 as the default

                        $(document).on(&#39;click&#39;, &#39;.pagination-link ul li&#39;, function () {
                            var page = $(this).attr(&#39;data-pagenum&#39;);
                            load_all_posts(page);
                        });
                    });
                </script>
                <div class="pag_loading">
                    <div class="pagination_container">
                        <div class="post-content"></div>
                    </div>
                </div>
            </div>
        </div>
    </div>
</div>

Code explanation

1. Use get_the_ID() to get the order ID: Inside the WP_Query loop, use the get_the_ID() function to get the ID of the current order.
2. Use the paged parameter to paging: The paged parameter of WP_Query is used to specify the current page number, simplifying the paging logic.
3. Simplified paging logic: The paging logic is simplified, using the max() and min() functions to determine the start and end page numbers of the loop.
4. HTML Structure: The HTML structure is optimized to make it easier to read and maintain.
5. Error handling: Added judgment on the $order object to ensure that the order object exists.
6. Use wp_reset_postdata(): After the WP_Query loop, call the wp_reset_postdata() function to restore the global $post object.

Things to note

• Make sure your version of WooCommerce is up to date to avoid potential compatibility issues.
• When processing order data, it is important to perform appropriate verification and escape to prevent security breaches.
• Adjust the order quantity displayed on each page according to actual needs.
• Optimize AJAX requests and reduce server load.
• Use the browser's developer tools to debug AJAX requests and responses.

Summarize

Through this article, you should be able to understand how to use WP_Query correctly to get WooCommerce order details and implement functions such as paging loading. The fixed code example solves the problems that existed in the original code and provides a clearer way to implement it. Remember to follow best practices to ensure your code is safe, efficient, and easy to maintain.

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