【问题标题】：Pass data into FormRequest in Laravel 5在 Laravel 5 中将数据传递到 FormRequest
【发布时间】：2016-01-06 04:33:05
【问题描述】：

在 Laravel 5 中如何将数据传递给 FormRequest 类？

背景

我正在尝试验证来自 HTML 选择元素的 get 变量。

我通过继承 FormRequest 并添加到规则数组来做到这一点。我想从文件列表中动态构建此验证规则以保持 DRY。

将此列表传递到 FileFormRequest 的最佳方式是什么？

app/Http/Controllers/UploadController.php（请原谅公共财产）

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Http\Requests;
use App\Http\Requests\FileFormRequest;
use App\Http\Controllers\Controller;
use File;

class UploadController extends Controller
{

    public $files = [];

    public function get(FileFormRequest $request)
    {
        $files_dir = storage_path('app').'/spreadsheets';
        foreach (File::allFiles($files_dir) as $file) {
            $file = $file->getBasename();
            $this->files[$file] = $file;
        }

        return view('main', array(
            'title' => '',
            'file_names' => $this->files,
            'file_name' => '',
            'sheet_name' => '',
            'encoding' => 'UTF-8'
        ));
    }

}

app/Http/Requests/FileFormRequest.php

<?php namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;
use Response;

class FileFormRequest extends FormRequest
{

    public function rules()
    {
        // What goes here in place of the empty array?
        $files = implode(',', []);

        return [
            'file_name' => 'sometimes|required|in:'.$files,
        ];

    }

    public function authorize()
    {
        return true;
    }
}

【问题讨论】：

标签： php laravel laravel-5

【解决方案1】：

你可以试试这个：

public function rules()
{
    // Get the REQUEST (GET/POST) variable
    $files = app('request')->get('form_field_name');

    return [
        'file_name' => 'sometimes|required|in:'.$files,
    ];

}

如果form_field_name 不是数组，则根据其包含的值将其设为数组。此外，如果需要大量代码，您可以创建另一个 protected 方法来从请求中获取输入，例如：

protected function getRequestInput()
{
    $files = app('request')->get('form_field_name');

    // Process it here and finally return, i.e:
    return $files; // array
}

所以您现在可以像这样从rules 方法中调用该方法：

$files = $this->getRequestInput();

【讨论】：

如果我理解正确，这将验证 files 与通过 form_field_name 传递的数据。不幸的是，form_field_name 是一个请求变量，并且可以由否定验证的用户修改。因此，我认为这不是解决方案。使用会话类似的东西可能会起作用，但感觉很hacky。

【解决方案2】：

好的，我解决了这个问题

将上传文件列表功能移动到实用程序界面和类中
使用服务提供者将实用程序类的实例公开为服务
将服务注入到 Controller 和 FormRequest 类中

代码是：

app/Contracts/Utilities/UploadFilesContract.php - 创建界面

<?php

namespace App\Contracts\Utilities;

interface UploadFilesContract {

    public function __construct($dir);

    public function getDir();

    public function getFilesBasenames();

}

app/Utilities/UploadFiles.php - 创建具有列表功能的类

<?php

namespace App\Utilities;

use Illuminate\Support\Facades\File;
use App\Contracts\Utilities\UploadFilesContract;

class UploadFiles implements UploadFilesContract {

    private $dir;
    private $files;

    public function __construct($dir = '')
    {
        $this->dir = storage_path('app').(0 < strlen($dir) ?  '/'.$dir : '');
        $this->files = File::allFiles($this->dir);
    }

    public function getDir()
    {
        return $this->dir;
    }

    public function getFilesBasenames()
    {
        $files = [];
        foreach ($this->files as $file) {
            $file = $file->getBasename();
            $files[$file] = $file;
        }
        return $files;
    }

}

app/Providers/UploadFilesServiceProvider.php - 将接口绑定到类的实例

<?php

namespace App\Providers;

use Illuminate\Support\ServiceProvider;
use App\Utilities\UploadFiles;

class UploadFilesServiceProvider extends ServiceProvider
{
    protected $defer = true;

    /**
     * Bootstrap the application services.
     *
     * @return void
     */
    public function boot()
    {
    }

    /**
     * Register the application services.
     *
     * @return void
     */
    public function register()
    {
        $this->app->bindShared('App\Contracts\Utilities\UploadFilesContract', function($app) {
            return new UploadFiles('spreadsheets');
        });
    }

    public function provides()
    {
        return ['App\Utilities\UploadFiles'];
    }
}

app/Http/Controllers/UploadController.php - 在构造函数中注入上传文件接口

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Http\Requests;
use App\Http\Requests\FileFormRequest;
use App\Contracts\Utilities\UploadFilesContract;

class UploadController extends Controller
{

    private $upload_files;

    public function __construct(UploadFilesContract $upload_files) {
        $this->upload_files = $upload_files;
    }

    public function get(FileFormRequest $request)
    {   
        return view('main', array(
            'title' => '',
            'file_names' => $this->upload_files->getFilesBasenames(),
            'file_name' => '',
            'sheet_name' => '',
            'encoding' => 'UTF-8'
        ));
    }

}

app/Http/Requests/FileFormRequest.php - 在构造函数中注入上传文件接口

<?php namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;
use App\Contracts\Utilities\UploadFilesContract;

class FileFormRequest extends FormRequest
{
    private $upload_files;

    public function __construct(array $query = array(), array $request = array(), array $attributes = array(), array $cookies = array(), array $files = array(), array $server = array(), $content = null, UploadFilesContract $upload_files)
    {
        parent::__construct($query, $request, $attributes, $cookies, $files, $server, $content);
        $this->upload_files = $upload_files;
    }

    /**
     * @return array
     */
    public function rules()
    {
        $files = implode(',', $this->upload_files->getFilesBasenames());

        $rules = [
            'file_name' => 'sometimes|required|in:'.$files,
        ];

        return $rules;
    }

    /**
     * @return bool
     */
    public function authorize()
    {
        return true;
    }
}

config/app.php - 注册提供者

<?php

// ...

'providers' => [

    // ...

    App\Providers\UploadFilesServiceProvider::class,

],

// ...

【讨论】：