Laravel 5从多(3)个表中获取数据

namespace App;

use Illuminate\Database\Eloquent\Model;

class User extends Model
{
    public function posts()
    {
        return $this->hasMany('App\Post');
    }
}

namespace App;

use Illuminate\Database\Eloquent\Model;

class Post extends Model
{
    public function user()
    {
        return $this->belongsTo('App\User');
    }

    public function comments()
    {
        return $this->hasMany('App\Comment');
    }
}

namespace App;

use Illuminate\Database\Eloquent\Model;

class Comment extends Model
{
    public function post()
    {
        return $this->belongsTo('App\Post');
    }
}

$user = User::find(1);
$posts = $user->posts;

foreach ($posts as $post) {
    echo $post->title;
    echo $post->content;

    $comments = $post->comments;
    foreach ($comments as $comment) {
        echo $comment->content;
    }
}