Php 是否基于作者后元数据自动填充分类后数据？

我试图使用作者元数据在给定作者的帖子上自动填充自定义分类法。目前，分类法在post页面上是可见的，但我打算在前端隐藏它，以避免意外的用户选择。（也是人口提前的原因）

注意：关联的分类术语和作者元数据是相同的（作者元数据选项是从现有分类术语中动态提取的）

出于某种原因，这是行不通的。我挠头想弄明白为什么——我认为逻辑是正确的。我遗漏了什么/有人能帮忙吗

提前谢谢

function update_school($post_id) {

  $post_author_id = get_post_field( 'post_author', $post_id ); // get the post author ID
  $school_title = get_the_author_meta( 'school2', $post_author_id ); // from the post author ID, get the author meta
  $school_slug = get_the_author_meta( 'school', $post_author_id ); // from the post author ID, get the author meta

  $school_term = get_term_by('slug', $school_slug, 'school'); // get term by the author meta called "school"
  $school_term_name = $school_term->name; // from the slug, get the school term name


  // update the post taxonomy "school" with author meta school variables above  
  wp_set_post_terms( $post_id, $school_term_name, 'school' );

} 

// run function on post save
add_action('save_post', 'update_school');

---

为任何想知道的人想出来：

function update_school( $post_id ) {
  $post_author_id = get_post_field( 'post_author', $post_id ); // get the post author ID
  $school_name = get_the_author_meta( 'school2', $post_author_id ); // from the post author ID, get the author meta
  $term = term_exists( $school_name, 'school');
  wp_set_post_terms( $post_id, $term, 'school' );

} 

// run function on post save
add_action( 'save_post', 'update_school' );