Laravel 5.1 在表单请求验证前修改输入-php问题

Laravel 5.1 Modify input before form request validation(Laravel 5.1 在表单请求验证前修改输入)

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问题描述

有没有办法在验证发生之前修改表单请求类中的输入字段?

Is there a way to modify input fields inside a form request class before the validation takes place?

我想如下修改一些输入日期字段，但它似乎不起作用.

I want to modify some input date fields as follows but it doesn't seem to work.

当我将 $this->start_dt 输入字段设置为 2016-02-06 12:00:00 和 $this->end_dt 到 2016-02-06 13:00:00 我仍然收到验证错误end_dt 必须在 start_dt 之后".这意味着当您更新 rules()<中的 $this->start_dt 和 $this->end_dt 时，输入请求值不会改变/code> 函数.


When I set $this->start_dt input field to 2016-02-06 12:00:00 and $this->end_dt to 2016-02-06 13:00:00 I still get validation error "end_dt must be after start_dt". Which means the input request values aren't getting changed when you update $this->start_dt and $this->end_dt inside the rules() function.
public function rules()
{
    if ($this->start_dt){
        $this->start_dt = Carbon::createFromFormat('d M Y H:i:s', $this->start_dt . ' ' . $this->start_hr . ':'. $this->start_min . ':00');
    }

    if ($this->end_dt){
        $this->end_dt = Carbon::createFromFormat('d M Y H:i:s', $this->end_dt . ' ' . $this->end_hr . ':'. $this->end_min . ':00');
    }

    return [
        'start_dt' => 'required|date|after:yesterday',
        'end_dt' => 'required|date|after:start_dt|before:' . Carbon::parse($this->start_dt)->addDays(30)            
    ];
}

注意: start_dt 和 end_dt 是日期选择器字段，start_hr、start_min 是下拉字段.因此，我需要通过组合所有字段来创建一个日期时间，以便我可以进行比较.

Note: start_dt and end_dt are date picker fields and the start_hr, start_min are drop down fields. Hence I need to create a datetime by combining all the fields so that I can compare. 
推荐答案
从 Laravel 5.4 开始，您可以覆盖 ValidatesWhenResolvedTrait 的 prepareForValidation 方法来修改任何输入.Laravel 5.1 应该可以实现类似的功能.
As of laravel 5.4 you can override the prepareForValidation method of the ValidatesWhenResolvedTrait to modify any input. Something similar should be possible for laravel 5.1.
请求中的示例
/**
 * Modify the input values
 *
 * @return void
 */
protected function prepareForValidation() {

    // get the input
    $input = array_map('trim', $this->all());

    // check newsletter
    if (!isset($input['newsletter'])) {
        $input['newsletter'] = false;
    }

    // replace old input with new input
    $this->replace($input);
}


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