创建附件时，请执行以下操作：

如果附件父ID用于具有排除的帖子类型的帖子，请不要执行任何操作。如果它不在排除的帖子类型列表中，请在隐藏的自定义分类中为其分配一个标记，例如。

function create_hidden_taxonomy() {
    register_taxonomy(
        \'hidden_taxonomy\',
        \'attachment\',
        array(
            \'label\' => __( \'Hidden Attachment Taxonomy\' ),
            \'public\' => false, // it\'s hidden!
            \'rewrite\' => false,
            \'hierarchical\' => false,
        )
    );
}
add_action( \'init\', \'create_hidden_taxonomy\' );

function tomjn_add_term( $post_id, \\WP_Post $p, $update ) {

    if ( \'attachment\' !== $p->post_type ) {
        return;
    }
    if ( wp_is_post_revision( $post_id ) ) {
        return;
    }
    if ( $p->post_parent ) {
        $excluded_types = array( \'example_post_type\', \'other_post_type\' );
        if ( in_array( get_post_type( $p->post_parent ), $excluded_types ) ) {
            return;
        }
    }
    $result = wp_set_object_terms( $post_id, \'show_in_media_library\', \'hidden_taxonomy\', false );
    if ( !is_array( $result ) || is_wp_error( $result ) ) {
        wp_die( "Error setting up terms") ;
    }
}
add_action( \'save_post\', \'tomjn_add_term\', 10, 3 );

/**
 * Only show attachments tagged as show_in_media_library
 **/
function assets_hide_media( \\WP_Query $query ){
    if ( !is_admin() ) {
        return;
    }
    global $pagenow;
    if ( \'upload.php\' != $pagenow && \'media-upload.php\' != $pagenow ) {
        return;
    }

    if ( $query->is_main_query() ) {
        $query->set(\'hidden_taxonomy\', \'show_in_media_library\' );
    }

    return $query;
}
add_action( \'pre_get_posts\' , \'assets_hide_media\' );

这给你留下了最后一个问题。附件只有在有此术语时才会显示，但是您已经上传的所有附件呢？我们需要回到过去，把这个词加上去。要做到这一点，您需要运行这样一段代码：

$q = new WP_Query( array(
    \'post_type\' => \'attachment\',
    \'post_status\' => \'any\',
    \'nopaging\' => true,
) );

if ( $q->have_posts() ) {
    global $post;
    while ( $q->have_posts() ) {
        $q->the_post();

        $post_id = get_the_ID();

        $excluded_types = array( \'example_post_type\', \'other_post_type\' );
        if ( $post->post_parent ) {
            if ( in_array( get_post_type( $post->post_parent ), $excluded_types ) ) {
                echo "Skipping ".intval( $post_id )." ".esc_html( get_the_title() )."\\n";
                continue;
            }
        }
        echo "Setting term for ".intval( $post_id )." ".esc_html( get_the_title() )."\\n";
        $result = wp_set_object_terms( $post_id, \'show_in_media_library\', \'hidden_taxonomy\', false );
        if ( !is_array( $result ) || is_wp_error( $result ) ) {
            echo "Error setting up terms";
        }
    }
    wp_reset_postdata();
} else {
    echo "No attachments found!\\n";
}

add_action( \'ajax_query_attachments_args\' , \'custom_ajax_query_attachments_args\' );

function custom_ajax_query_attachments_args( $query ) {

    if( $query[\'post_type\'] != \'attachment\' ) {

        return $query;

    }


    $posts = get_posts([
      \'post_type\' => \'YOUR_CUSTOM_POST_TYPE\',
      \'post_status\' => \'publish\',
      \'numberposts\' => -1
    ]);

    foreach($posts as $post){

        $excluded_cpt_ids[] = $post->ID;
    }  

    $query[\'post_parent__not_in\'] = $excluded_cpt_ids;

    return $query;

}