我如何通过1个请求填充2个数据透视表

Question

我有桌子的用户

class User extends Authenticatable
{
    use Notifiable;

    protected $guarded = ['group_c', 'group_s', 'categories'];

    /**
     * The attributes that should be hidden for arrays.
     *
     * @var array
     */
    protected $hidden = [
        'password', 'remember_token',
    ];

    public function groups()
    {
        return $this->belongsToMany('App\Group');
    }

    public function categories()
    {
        return $this->belongsToMany('App\Category');
    }
}

该表与2个注释器表具有“多对多”关系：组

class Group extends Model
{
    public function users()
    {
        return $this->belongsToMany('App\User');
    }
}

和类别

class Category extends Model
{
    public function Users()
    {
        return $this->belongsToMany('App\User');
    }
}

我从Post请求中获取数据，并将其放入Users表中，但是将“ group”字段写入控制器中的“ group_user”数据透视表中：

class UserController extends Controller
{

    public function create_user(CrateNewUser $request)
    {
        //dd(Request::all());
        if (Request::input('user_type') == '1') {
            $groups = Request::input('group_c');
            $categories = Request::input('categories');
            User::create(Request::all())->groups()->attach($groups);
        } elseif (Request::input('user_type') == '2') {
            $groups = Request::input('group_s');
            $categories = Request::input('categories');
            User::create(Request::all())->groups()->attach($groups);
        }

        return $this->manage_users();
    }
}

但我还需要通过一个sql请求将数据从另一个Post字段“ categories”写入另一个数据透视表category_user，我该怎么做？

Answer 1

为了使用用户的ID将用户链接到一组组/类别，您需要使用sync（）方法。 它将更新数据透视表，以便仅链接同步的记录。

以下应该可以解决问题：

$user = User::create(Request::all());
$user->groups()->sync($groups);
$user->categories()->sync($categories);