Laravel 5.2 在控制器之前的表单验证后修改请求

Question

我正在使用 laravel 5.2，并且我正在使用 laravel 供应商提供的表单请求来使我的代码干净，所以我的控制器上没有很多代码：

public function store( CouponRequest $request )
{
    DB::beginTransaction();
    try {
        $coupon = Coupon::create( $request->all() );

        DB::commit();
        return redirect()->route('admin.coupons.index');
    } catch (\Exception $e) {
        DB::rollback();
        return redirect()->back()->withInput();
    }

这是关于我的申请表的示例代码：

public function rules()
{
    switch ( strtolower( $this->method ) ) {
        case 'post':
        {
            return [
                'code' => 'required|unique:coupons,code',
                'name' => 'required',
                'start_year' => 'required',
                'start_month' => 'required',
                'start_day' => 'required',
                'start_time' => 'required',
                'finish_year' => 'required',
                'finish_month' => 'required',
                'finish_day' => 'required',
                'finish_time' => 'required',
                'using_time' => 'required',
                'type' => 'required',
                'free_shipment' => 'required',
                'target' => 'required',
                'target_user' => 'required'
            ];
        }
        case 'put':
        {
            return [
                'code' => 'required',
                'name' => 'required',
                'start_year' => 'required',
                'start_month' => 'required',
                'start_day' => 'required',
                'start_time' => 'required',
                'finish_year' => 'required',
                'finish_month' => 'required',
                'finish_day' => 'required',
                'finish_time' => 'required',
                'using_time' => 'required',
                'type' => 'required',
                'free_shipment' => 'required',
                'target' => 'required',
                'target_user' => 'required'
            ];
        }
        default:
        {
            return [];
        }
    }
}

我应该把这个命令放在哪里？ ：

$start_date = Carbon::create( $request->start_year, $request->start_month, $request->start_day );
$start_date->setTimeFromTimeString( $request->start_time );
$finish_date = Carbon::create( $request->finish_year, $request->finish_month, $request->finish_day );
$finish_date->setTimeFromTimeString( $request->finish_time );

如果我在验证之前放置此代码，当某些字段没有被用户填写好时，我可能会出错。

所以我想要的是在验证成功后放置这段代码，但我不想把它放在我的控制器上。

验证成功后是否可以调用FormRequest函数来修改我的请求？

我觉得控制器代码多的时候不好，所以我想最小化我的控制器代码。

Answer 1

我将尝试使用 FormRequest。如果这里的意图是 validate 和 assign start_date 和 finish_date，这可能是在 Laravel 中这样做的合理方式：

public function rules()
{
    switch ( strtolower( $this->method ) ) {
        case 'post':
        {
            return [
                'code' => 'required|unique:coupons,code',
                'name' => 'required',
                'start_year' => 'required',
                'start_month' => 'required',
                'start_day' => 'required',
                'start_time' => 'required',
                'finish_year' => 'required',
                'finish_month' => 'required',
                'finish_day' => 'required',
                'finish_time' => 'required',
                'using_time' => 'required',
                'type' => 'required',
                'free_shipment' => 'required',
                'target' => 'required',
                'target_user' => 'required'
            ];
        }
        case 'put':
        {
            return [
                'code' => 'required',
                'name' => 'required',
                'start_year' => 'required',
                'start_month' => 'required',
                'start_day' => 'required',
                'start_time' => 'required',
                'finish_year' => 'required',
                'finish_month' => 'required',
                'finish_day' => 'required',
                'finish_time' => 'required',
                'using_time' => 'required',
                'type' => 'required',
                'free_shipment' => 'required',
                'target' => 'required',
                'target_user' => 'required'
            ];
        }
        default:
        {
            return [];
        }
    }
}

/**
 * @inheritDoc
 *
 * This method overrides Laravel's defeault FormRequest
 * to create validator with `after()` hook
 */
protected function validator($validator)
{
    $validator
        ->make(
            $this->validationData(), $this->rules(), $this->messages(), $this->attributes()
        )
        ->after(function($validator) {

            if ($date = $this->getCarbonInstanceFromPrefix('start')) {
                $request->start_date = $date;
            } else {
                $validator->errors()
                    ->add('start_year', 'Invalid starting date and time');
            }

            if ($date = $this->getCarbonInstanceFromPrefix('finish')) {
                $request->finish_year = $date;
            } else {
                $validator->errors()
                    ->add('finish_year', 'Invalid finish date and time');
            }

        });
}

/**
 * Retrieve carbon instance from current request, using prefix
 *
 * @param  string $prefix
 *
 * @return Carbon|null
 */
protected function getCarbonInstanceFromPrefix($prefix = '')
{
    try {
        $date = Carbon::create( 
            $request->get($prefix . '_year'), 
            $request->get($prefix . '_month'), 
            $request->get($prefix . '_day') 
        );
        $date->setTimeFromTimeString( $request->get($prefix . '_time') );
        return $date;
    } catch (\Exception $e) {
        return null;
    }
}

快速说明

FormRequest 本质上是从Illuminate\Foundation\Http\FormRequest 扩展而来，并且可以覆盖创建Validator 实例的方法。通过创建自定义验证器，您可以附加 after() 事件来验证每个日期输入，并一次性为请求分配额外的参数。