如何在WooCommerce中添加类型为'post'的帖子添加“添加到购物车”功能？

Question

我已经在帖子中添加了“添加到购物车”按钮（对于带有type = post的帖子），具有相同的POST结束点，例如“添加到购物车”功能（使用type = product），但无法正常工作，就像那样：

    <?php
    add_filter('woocommerce_get_price','reigel_woocommerce_get_price',20,2);
    function reigel_woocommerce_get_price($price,$post){
        if ($post->post->post_type === 'post')
        $price = get_post_meta($post->id, "price", true);
        return $price;
     }
    add_filter('the_content','rei_add_to_cart_button', 20,1);
    function rei_add_to_cart_button($content){
        global $post;
        if ($post->post_type !== 'post') {return $content; }

        ob_start();
        ?>
        <form action="" method="post">
            <input name="add-to-cart" type="hidden" value="<?php echo $post->ID ?>" />
            <input name="quantity" type="number" value="1" min="1"  />
            <input name="submit" type="submit" value="Add to cart" />
        </form>
        <?php

        return $content . ob_get_clean();
    }
    ?>

参考：http://reigelgallarde.me/programming/how-to-add-custom-post-type-to-woocommerce/

感谢您的支持！