如何在Laravel 5.2中存储多个选择值

// Choice.php
namespace App;

use Illuminate\Database\Eloquent\Model;

class Choice extends Model
{
    protected $fillable = ['name'];

    public function users()
    {
        return $this->belongsToMany(User::class, 'choice_user');
    }
}

// User.php
namespace App;

use Illuminate\Foundation\Auth\User as Authenticatable;

class User extends Authenticatable
{
    // ...

    public function choices()
    {
        return $this->belongsToMany(Choice::class, 'choice_user');
    }
}

// 在控制器中的使用示例
use App\User;
use App\Choice;

$user = User::find(1);

// 创建新的选项
$choice = Choice::create(['name' => '选项1']);

// 将选项与用户关联
$user->choices()->attach($choice);

// 获取用户的选项
$choices = $user->choices;

// 取消选项与用户的关联
$user->choices()->detach($choice);