如何使用 Laravel 创建数据库驱动的多级导航菜单
我是 Laravel 4 的新手，我对它的模型完全感到困惑.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，我厌倦了无法前进，这是我到现在想出的代码:
I'm new to Laravel 4 and I'm totally confused about it's models. I'm trying to create a database-driven navigation menu for my project and all I know is I have to create a model to interact with the database (based on my knowledge from codeigniter). I have been studying alot and I'm tired of not being able to go forward, this is the code I have come up with till now:
/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:
And this is my Navigation database table I will use for this Model:
推荐答案
所以在从不同来源进行更多搜索和阅读之后，这就是我想出的，并且运行良好:
So after doing much more searching and reading from different sources this is what I came up with and it's working fine:
/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>
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