Laravel - 文件需要验证，反之亦然

Question

好的，这个问题很搞笑，但我需要解决它：

我正在使用 Laravel 5.2 并制作表单来上传图片。我有这个规则：

public static $rules = array(
    'picture ' => 'required|mimes:jpg,jpeg,png',
    'description' => 'required'
);

The description validation is ok, but when validating the picture, the 'required' attribute seems to work vice versa - when a file (picture) is selected, then it fails to validate (error: 'The picture field is required' )，当没有文件时，验证成功。

这是来自我的控制器的代码：

    Log::info('Validating store picture request');

    $validator = Validator::make(Input::all(), Picture::$rules);

    $validator->after(function ($validator) {
        Log::info('After method');
        // check for validity of the file
        if (!Input::file('picture')->isValid()) {
            Log::info('Picture is not valid');
            $validator->errors()->add('picture', 'Picture is not valid');
        }
    });

    if ($validator->fails()) {
        Log::info('Validation failed, returning back');

        $messages = $validator->messages();
        return back()
            ->withErrors($validator)
            ->withInput(Input::except('picture'));
    }
    Log::info('Validation succeed, continuing'); 

编辑：我以这种方式记录了 Validator 类：

protected function validateRequired($attribute, $value)
{
    Log::info('Just logging required validation');
    Log::info('is_null: '.is_null($value));

    if (is_null($value)) {
        Log::info('Reason: is_null');
        return false;
    } elseif (is_string($value) && trim($value) === '') {
        return false;
    } elseif ((is_array($value) || $value instanceof Countable) && count($value) < 1) {
        return false;
    } elseif ($value instanceof File) {
        Log::info('File, getpath '.$value->getPath());
        return (string) $value->getPath() != '';
    }

    Log::info('Continuing');
    return true;
}

这就是我提交表单时得到的结果带有文件：

[2016-08-15 12:18:27] local.INFO: Validating store picture request  
[2016-08-15 12:18:27] local.INFO: Just logging required validation  
[2016-08-15 12:18:27] local.INFO: is_null: 1  
[2016-08-15 12:18:27] local.INFO: Reason: is_null  
[2016-08-15 12:18:27] local.INFO: Just logging required validation  
[2016-08-15 12:18:27] local.INFO: is_null: 1  
[2016-08-15 12:18:27] local.INFO: Reason: is_null  
[2016-08-15 12:18:27] local.INFO: After method  
[2016-08-15 12:18:27] local.INFO: Validation failed, returning back  

编辑：当没有文件时，我得到相同的日志输出，所以现在它的行为方式相同..我不知道为什么每次请求执行两次：/

Answer 1

我刚刚注意到，在您的规则数组中，pictures 键中有一个空格。
我试图检查该空格是否会导致任何错误。是的，它确实没有通过验证。想了想，我认为这应该不会导致错误。

尝试删除该空间。

public static $rules = array(
    'picture' => 'required|mimes:jpg,jpeg,png', //Remove space from 'picture'
    'description' => 'required'
);