我想通过缩略图和标题显示每个产品下面的4-5篇文章。对于所有产品，我添加了一个自定义分类法，将所有这些产品按其自己的组术语进行分组。可以说是一个自定义标记。

现在，我想在每个产品下查询5篇文章，它们共享为自定义分类法组选择的相同术语。到目前为止，我已经创建了这个工具来按分类法和术语查询帖子：

function shortcode_imwz_custom_taxonomy_by_term() {
  global $wp_query,$post;
  // wp_get_object_terms( $post->ID, \'portfolio-skills\', array( \'fields\' => \'names\' ) );
  // https://stackoverflow.com/a/14798097/460885
  // $product_terms = wp_get_object_terms( $post->ID,  \'product\' );
  // For performance, functions like get_the_terms() (which the results of has been cached), 
  // should be used.
  // get the terms Retrieve the terms of the taxonomy that are attached to the post.
  // $term = get_term_by( \'slug\', get_query_var( \'term\' ), get_query_var( \'taxonomy\' ) );
  // https://wordpress.stackexchange.com/a/21425/12260
  $terms = get_the_terms( get_the_ID(), \'group\' );


  $loop = new WP_Query( array(
      \'posts_per_page\'    => 5,
      \'post_type\'         => \'product\',
      \'orderby\'           => \'menu_order title\',
      \'order\'             => \'ASC\',
      \'tax_query\'         => array( array(
          \'taxonomy\'  => \'group\',
          \'field\'     => \'slug\',
          \'terms\'     =>  $terms
      ) )
  ) );

  if( ! $loop->have_posts() ) {
      return false;
  }

  while( $loop->have_posts() ) {
      $loop->the_post();
      // echo thumbnail
      echo the_title();
  }

  wp_reset_postdata();
}

我根据这段代码添加了一个短代码

function register_grouped_products_shortcode() {
  add_shortcode( \'grouped-products\', \'shortcode_imwz_custom_taxonomy_by_term\' );
}
add_action( \'init\', \'register_grouped_products_shortcode\' );

要使用WP查询的产品，并添加了一个选项。但我还没有看到任何加载的内容。我错过了什么？我发现有很多选项可以让术语过滤分类法上的帖子和输入的术语。。也许这是个问题？

$slugs = [];
if ( $terms && ! is_wp_error( $terms ) ) {
    $slugs = wp_list_pluck( $terms, \'slug\' );
}

// Example 1: Query posts by term slugs.
\'tax_query\' => array( array(
    \'taxonomy\' => \'group\',
    \'field\'    => \'slug\', // if this is \'slug\'
    \'terms\'    =>  $slugs // then this should be term slugs
) )

// Example 2: Query posts by term IDs.
\'tax_query\' => array( array(
    \'taxonomy\' => \'group\',
    \'field\'    => \'term_id\', // if this is \'term_id\'
    \'terms\'    =>  $ids      // then this should be term IDs
    // assume $ids is wp_list_pluck( $terms, \'term_id\' )
) )