php - 如何使用 Laravel 创建数据库驱动的多级导航菜单

Question

我是 Laravel 4 的新手，我对它的模型一头雾水。我正在尝试为我的项目创建一个数据库驱动的导航菜单，我所知道的是我必须创建一个模型来与数据库交互(基于我从 codeigniter 获得的知识)。我一直在学习，我厌倦了无法继续前进，这是我到目前为止想出的代码:

/app/models/navigation.php

<?php

class Navigation extends Eloquent {

    /**
     * The database table used by the model.
     *
     * @var string
     */
    protected $table = 'navigation';

    /**
     * Get the unique identifier for the menu item.
     *
     * @return mixed
     */
    public function getItemIdentifier()
    {
        return $this->getKey();
    }

}

这是我将用于此模型的导航数据库表:

Answer 1

因此，在从不同来源进行更多搜索和阅读之后，这就是我想出的并且工作正常:

/app/models/Navigation.php

<?php

class Navigation extends Eloquent {

    /**
     * The database table used by the model.
     *
     * @var string
     */
    protected $table = 'navigation';

    public function parent() {

        return $this->hasOne('navigation', 'id', 'parent_id');

    }

    public function children() {

        return $this->hasMany('navigation', 'parent_id', 'id');

    }  

    public static function tree() {

        return static::with(implode('.', array_fill(0, 4, 'children')))->where('parent_id', '=', NULL)->get();

    }

}

/app/controllers/HomeController.php

<?php

class HomeController extends BaseController {

    protected $layout = "layouts.main";

    public function showWelcome()
    {

        $items = Navigation::tree();

        $this->layout->content = View::make('layouts.home.index')->withItems($items);

    }

}

/app/views/layouts/home/index.blade.php

<ul>
    @foreach($items as $item)
        <li>{{ $item->title }}
            @foreach($item['children'] as $child)
            <li>{{ $child->title }}</li>
            @endforeach
        </li>
    @endforeach
</ul>