如何在Octobercms中与子类别分开的页面上显示类别？

// 类别模型 Category.php
class Category extends Model
{
    public $hasMany = [
        'subcategories' => 'Subcategory'
    ];
}

// 子类别模型 Subcategory.php
class Subcategory extends Model
{
    public $belongsTo = [
        'category' => 'Category'
    ];
}

// 类别控制器 CategoryController.php
public function index()
{
    $categories = Category::all();
    $this->page['categories'] = $categories;
}

// 类别视图 index.htm
{% for category in categories %}
    <h2>{{ category.name }}</h2>
    <ul>
        {% for subcategory in category.subcategories %}
            <li>{{ subcategory.name }}</li>
        {% endfor %}
    </ul>
{% endfor %}

// 子类别控制器 SubcategoryController.php
public function show($categoryId)
{
    $category = Category::find($categoryId);
    $this->page['category'] = $category;
}

// 子类别视图 show.htm
<h2>{{ category.name }}</h2>
<p>{{ category.description }}</p>