如何更改最大文件大小的 Laravel 验证消息（以 MB 而不是 KB 为单位）？

Question

Laravel 附带此验证消息，以千字节为单位显示文件大小：

file' => 'The :attribute may not be greater than :max kilobytes.',

我想以显示兆字节而不是千字节的方式对其进行自定义。 所以对于用户来说它看起来像：

“文档不得大于 10 兆字节。”

我该怎么做？

Answer 1

我们可能在不同的页面上，这就是我想说的。我希望这有帮助。干杯！

public function rules()
{
    return [
        'file' => 'max:10240',
     ];
}

public function messages()
{
    return [
        'file.max' => 'The document may not be greater than 10 megabytes'
    ];
}

Answer 2

文件： app/Providers/AppServiceProvider.php

public function boot()
{
    Validator::extend('max_mb', function ($attribute, $value, $parameters, $validator) {

        if ($value instanceof UploadedFile && ! $value->isValid()) {
            return false;
        }

        // SplFileInfo::getSize returns filesize in bytes
        $size = $value->getSize() / 1024 / 1024;

        return $size <= $parameters[0];

    });

    Validator::replacer('max_mb', function ($message, $attribute, $rule, $parameters) {
        return str_replace(':' . $rule, $parameters[0], $message);
    });
}

不要忘记导入正确的类。

---

文件： resources/lang/en/validation.php

'max_mb' => 'The :attribute may not be greater than :max_mb MB.',

'accepted'             => 'The :attribute must be accepted.',
'active_url'           => 'The :attribute is not a valid URL.',
...

相应地改变

config('upload.max_size')

。

Answer 3

您可以创建自己的规则，并使用与现有规则相同的逻辑，但无需转换为 KB。

为此，请在您的

Validator::extend

文件中添加对

AppServiceProvider.php

方法的调用，例如：

<?php namespace App\Providers;

use Illuminate\Support\ServiceProvider;
use Symfony\Component\HttpFoundation\File\UploadedFile;

class AppServiceProvider extends ServiceProvider
{
    /**
     * Bootstrap any application services.
     *
     * @return void
     */
    public function boot()
    {
        Validator::extend('max_mb', function($attribute, $value, $parameters, $validator) {
            $this->requireParameterCount(1, $parameters, 'max_mb');

            if ($value instanceof UploadedFile && ! $value->isValid()) {
                return false;
            }

            // If call getSize()/1024/1024 on $value here it'll be numeric and not
            // get divided by 1024 once in the Validator::getSize() method.

            $megabytes = $value->getSize() / 1024 / 1024;

            return $this->getSize($attribute, $megabytes) <= $parameters[0];
        });
    }
}

然后要更改错误消息，您只需编辑验证语言文件即可。

另见手册中关于自定义验证规则的部分

Answer 4

这个功能有效

public function getSize()
{
    $kb = 1024;
    $mb = $kb * 1024;
    
    if ($this->size > $mb)
        return @round($this->size / $mb, 2) . ' MB';
    return @round($this->size / $kb, 2) . ' KB';
}

Answer 5

这就是我将如何使用带有自定义验证消息的 Request 进行验证，而不是 KB：

1. 在 App\HTTP\Requests 文件夹中创建一个名为 StoreTrackRequest.php 的请求文件，内容如下

   <?php
   
   namespace App\Http\Requests;
   
   use App\Http\Requests\Request;
   
   class StoreTrackRequest extends Request
   {
       /**
        * Determine if the user is authorized to make this request.
        *
        * @return bool
        */
       public function authorize()
       {
           return true;
       }
   
       /**
        * Get the validation rules that apply to the request.
        *
        * @return array
        */
       public function rules()
       {
           return [
               "name" => "required",
               "preview_file" => "required|max:10240",
               "download_file" => "required|max:10240"
           ];
       }
   
       /**
        * Get the error messages that should be displayed if validation fails.
        *
        * @return array
        */
       public function messages()
       {
           return [
               'preview_file.max' => 'The preview file may not be greater than 10 megabytes.',
               'download_file.max' => 'The download file may not be greater than 10 megabytes.'
           ];
       }
   }
   

2. 在控制器内部，确保通过 StoreTrackRequest 请求执行验证：

   public function store($artist_id, StoreTrackRequest $request)
   {
        // Your controller code
   }
   

Answer 6

在Laravel 8

生成新的验证规则。

php artisan make:rule MaxSizeRule

按如下方式编辑您的规则。

<?php

namespace App\Rules;

use Illuminate\Contracts\Validation\Rule;

class MaxSizeRule implements Rule
{
    private $maxSizeMb;

    /**
     * Create a new rule instance.
     *
     * @return void
     */
    public function __construct($maxSizeMb = 8)
    {
        $this->maxSizeMb = $maxSizeMb;
    }

    /**
     * Determine if the validation rule passes.
     *
     * @param  string  $attribute
     * @param  mixed  $value
     * @return bool
     */
    public function passes($attribute, $value)
    {
        $megabytes = $value->getSize() / 1024 / 1024;

        return $megabytes < $this->maxSizeMb;
    }

    /**
     * Get the validation error message.
     *
     * @return string
     */
    public function message()
    {
        return 'The :attribute may not be greater than ' . $this->maxSizeMb . ' MB.';
    }
}

在您的验证请求中使用如下

return [
    ...
    'banner_image' => ['required', 'file', 'mimes:jpeg,png,jpg,svg', new MaxSizeRule(10)],
    ...
];

Answer 7

将resources\lang n alidation.php中的字符串改为

'file' => 'The :attribute may not be greater than 10 Megabytes.',

并将

$rule

定义为

$rules = array(
   'file'=>'max:10000',
);