WordPress：编辑帖子时不会显示分配给自定义帖子的分类法

Question

在我的Wordpress网站上，我使用了一个自定义帖子（称为跟踪，可以在附加的代码中看到）。在此自定义帖子中包含分类法（称为track_category，也可以在随附的代码中看到）。尽管每个帖子都可以有多个轨道类别，但实际上，每个轨道都只有一个分类法（“远足”，“步行”，“山地自行车”或“公路自行车”）。

我创建了一些Track类型的帖子。每个帖子都有不同的分类法（“远足”，“步行”，“山地自行车”和“公路自行车”）

用户可以编辑曲目。编辑轨道时，我希望当前分配的分类法可以正确显示在下拉列表框中（然后用户可以更改分类法）。

但是，我的问题是在编辑自定义帖子时，未显示指定的分类法。始终显示第一个分类类型（即远足）。

为什么？！

已附加代码。任何想法都将非常受欢迎。

<?php

// This line is from the post template
echo do_shortcode('[sut_form alreadysubmitted="' . 1 . '" postid="' . $track_ID . '"]');


// Following code is in the plugin
add_shortcode('sut_form', 'sut_form_shortcode');

function sut_form_shortcode($atts, $content = null) {
    $params = shortcode_atts(array(
        'alreadysubmitted' => false,
        'postid' => '',
    ), $atts );

$sut_postID = $params['postid'];  //$sut_postID is now the ID of the custom post being looked at

// Lot of other code
// Lot of other code

$sut_track_name = get_the_title($sut_postID);
$sut_track_sentence = get_field('sentence', $sut_postID);

$terms = get_the_terms($sut_postID, 'track_category');
$sut_track_category = $terms[0]->name; // Custom post can only have one taxonomy so can select the first

echo sut_get_create_track_form($sut_track_name, $sut_track_sentence, $sut_track_category); // Create form
// PROBLEM --> resulting form does NOT show the taxonomy of the post. It always show the first taxonomy ( = Hike)
}


function sut_get_create_track_form($sut_track_name = '', $sut_track_sentence = '', $sut_track_category = ''){
    $out .= '<form id="create_track_form" method="post" action="" enctype="multipart/form-data">';
    // Other parts of the form
    $out .= '<label for="sut_track_category">Track type</label><br/>';  
    $out .= sut_get_track_categories_dropdown('track_category', $sut_track_category) . '<br/>';          
    // Other parts of the form
    $out .= '<input type="submit" id="sut_submit" name="sut_submit" value="Submit Track For Publication">';
    $out .= '</form>';

return $out;
}


function sut_get_track_categories_dropdown($taxonomy, $selected){
    return wp_dropdown_categories(array('taxonomy' => $taxonomy, 'name' => 'sut_track_category', 'selected' => $selected, 'hide_empty' => 0, 'echo' => 0));
}


add_action('init', 'sut_plugin_init');

function sut_plugin_init(){
    $track_type_labels = array(
        'name' => _x('Tracks', 'post type general name'),
        'singular_name' => _x('Track', 'post type singular name'),
        'add_new' => _x('Add New Track', 'track'),
        'add_new_item' => __('Add New Track'),
        'edit_item' => __('Edit Track'),
        'new_item' => __('Add New Track'),
        'all_items' => __('View Tracks'),
        'view_item' => __('View Track'),
        'search_items' => __('Search Tracks'),
        'not_found' =>  __('No Tracks found'),
        'not_found_in_trash' => __('No Tracks found in Trash'), 
        'parent_item_colon' => '',
        'menu_name' => 'Tracks'
    );


$track_type_args = array(
    'labels' => $track_type_labels,
    'public' => true,
    'query_var' => true,
    'rewrite' => true,
    'capability_type' => 'post',
    'has_archive' => true, 
    'hierarchical' => false,
    'menu_position' => null,
    'supports' => array('title', 'editor', 'author')
); 


register_post_type('tracks', $track_type_args);

$track_category_labels = array(
        'name' => _x( 'Track Categories', 'taxonomy general name' ),
        'singular_name' => _x( 'Track', 'taxonomy singular name' ),
        'search_items' =>  __( 'Search Track Categories' ),
        'all_items' => __( 'All Track Categories' ),
        'parent_item' => __( 'Parent Track Category' ),
        'parent_item_colon' => __( 'Parent Track Category:' ),
        'edit_item' => __( 'Edit Track Category' ), 
        'update_item' => __( 'Update Track Category' ),
        'add_new_item' => __( 'Add New Track Category' ),
        'new_item_name' => __( 'New Track Name' ),
        'menu_name' => __( 'Track Categories' ),
    );  

$track_category_args = array(
    'hierarchical' => true,
    'labels' => $track_category_labels,
    'show_ui' => true,
    'query_var' => true,
    'rewrite' => array( 'slug' => 'track_category' ),
);


  register_taxonomy('track_category', array('tracks'), $track_category_args);
  $default_track_cats = array('Hike', 'Walk', 'Mountain bike', 'Road bike');
  foreach($default_track_cats as $cat){
        if(!term_exists($cat, 'track_category')) wp_insert_term($cat, 'track_category');
    }
}