我正在尝试从中包含子类别的类别中获取\\u posts（）。要展示一个例子，请看下面的图片。

所以，正如你所看到的。家长和孩子在里面都有帖子。我只想预览孩子们的内容一次，而不是两次。下图显示了我的意思。您可以看到，某些项目被检索了两次。

我已经创建了一个短代码，但我不知道如何使它的第一部分仅获取父类别中的帖子（首先从甜点中获取），然后显示子类别（烘焙饼干面团和煎饼）中的帖子（如果存在）。

add_shortcode(\'TEDS_MENU\', \'fetch_teds_menu_items\');
function fetch_teds_menu_items($atts)
{
  $atts = shortcode_atts(array(
    \'category_name\' => \'\'
  ), $atts);

  $category = get_term_by(\'name\', $atts[\'category_name\'], \'category\');

  if (!$category) {
    return \'\';
  }

  $args = array(
    \'category__in\' => [$category->term_id],
    \'post_type\' => \'menu\',
    \'numberposts\' => -1,
    \'post_status\' => \'publish\'
  );

  $subcategories = get_categories(
    array(
      \'parent\' => $category->term_id
    )
  );

  $output = \'<section id="\' . $category->slug . \'">\';
  $menu_items = get_posts($args);
  foreach ($menu_items as $menu_item) {
    setup_postdata($menu_item);
    $output .= \'<div class="teds-menu-item-wrapper">\';
    $output .= \'<h3 class="teds-menu-item__title">\' . $menu_item->post_title . \'</h3>\';
    $output .= \'<div class="teds-menu-item">\';
    $output .= \'<div class="teds-menu-item-description">\';
    $output .= \'<p class="teds-menu-item-description__text">\' . $menu_item->post_content . \'</p>\';
    $output .= \'</div>\';
    $output .= \'<ul class="teds-menu-prices-list">\';
    if (get_post_meta($menu_item->ID, \'regular_size_price\')[0] || get_post_meta($menu_item->ID, \'large_size_price\')[0]) {
      $output .= \'<li class="menu-prices-list--item">R \' . get_post_meta($menu_item->ID, \'regular_size_price\')[0]  . \' EGP</li>\';
      $output .= \'<li class="menu-prices-list--item">L \' . get_post_meta($menu_item->ID, \'large_size_price\')[0] . \' EGP</li>\';
    }
    if (get_post_meta($menu_item->ID, \'price\')[0]) {
      $output .= \'<li class="teds-menu-prices-list--item">\' . get_post_meta($menu_item->ID, \'price\')[0] . \' EGP</li>\';
    }
    $output .= \'</ul>\';
    $output .= \'</div>\';
    $output .= \'</div>\';
  }
  if ($subcategories) {
    $output .= \'<section class="teds-menu-subcategory">\';
    foreach ($subcategories as $subcategory) {
      $output .= \'<div class="teds-menu-subcategory__content">\';
      $output .= \'<h2 class="teds-subcategory-title">\' . $subcategory->name . \'</h2>\';
      $subcategory_items = get_posts(array(
        \'category\' => $subcategory->cat_ID,
        \'post_type\' => \'menu\',
        \'numberposts\' => -1,
        \'post_status\' => \'publish\'
      ));
      foreach ($subcategory_items as $subcategory_item) {
        $output .= \'<div class="teds-subcategory-item">\';
        $output .= \'<div class="teds-subcategory-item__content">\';
        $output .= \'<h3 class="teds-subcategory-item__title">\' . $subcategory_item->post_title . \'</h3>\';
        if ($subcategory_item->post_content) {
          $output .= \'<p class="class="menu-prices-list--item teds-subcategory-item__desc">\' . $subcategory_item->post_content . \'</p>\';
        }
        $output .= \'</div>\';
        if (get_post_meta($subcategory_item->ID, \'price\')[0]) {
          $output .= \'<ul class="teds-menu-prices-list">\';
          $output .= \'<li class="teds-menu-prices-list--item">\' . get_post_meta($subcategory_item->ID, \'price\')[0] . \' EGP</li>\';
          $output .= \'</ul>\';
        }
        $output .= \'</div>\';
      }
      $output .= \'</div>\';
      wp_reset_postdata();
    }
    wp_reset_postdata();
    $output .= \'</section>\';
  }
  $output .= "</section>";
  wp_reset_postdata();
  return $output;
}

UPDATE: 下列的@Sally CJ\'s的答案解决了某些帖子显示两次的问题。但在其他一些类别中，帖子已经消失。例如，以下类别包括帖子，但不再显示：

$args = array(
  \'category__in\' => [ get_cat_ID( $category_name ) ], // use category__in
  //\'category_name\' => $category_name,                // and not this.
  \'post_type\' => \'menu\',
  \'numberposts\' => -1,
  \'post_status\' => \'publish\'
);

function fetch_teds_menu_items($atts)
{
  $atts = shortcode_atts(array(
    \'category_name\' => \'\'
  ), $atts);

  if ( ! $category = get_term_by( \'name\', $atts[\'category_name\'], \'category\' ) ) {
    return \'\';
  }

  $args = array(
    \'category__in\' => [ $category->term_id ],
    \'post_type\' => \'menu\',
    \'numberposts\' => -1,
    \'post_status\' => \'publish\'
  );

  $meta_data = get_term_meta($category->term_id, \'category_featured_image\', TRUE);
  // $category_image = wp_get_attachment_url($meta_data);

  $subcategories = get_categories(
    array(
      \'parent\' => $category->term_id
    )
  );

  $output = \'<section id="\' . $category->slug . \'">\';
  ...
  return $output;
}