Laravel 5：从分派的命令中检索数据

Question

我有一个编写的命令UploadPhotoCommand ，用于将照片上传到我的应用程序。 该命令不是自处理的，因此我编写了一个处理程序UploadPhotoCommandHandler来配合它。

我像这样从控制器发出命令：

<?php

namespace App\Http\Controllers\Photos;

use App\Commands\Photos\UploadPhotoCommand;
use App\Http\Requests\Photos\UploadRequest;

class UploadController {

    public function process(UploadRequest $request)
    {
        try
        {
            $this->dispatch(
                new UploadPhotoCommand($request->file('photo'));
            );
        }
        catch (\Exception $e)
        {
            \Log::error($e);
            return response()->json(['errors' => 'Sorry, something went wrong, please try again later.']);
        }

        // I want to use the ID of the uploaded photo here
        return response()->json(['success' => 'Photo uploaded successfully']);
    }

}

在命令处理程序中，我通过移动上载的图像，创建缩略图等并将记录添加到数据库来处理照片的上载过程。

我的问题是我想从命令中检索上传的照片的ID并使用它。 我的意图是在响应中返回有关上传的照片的更多信息，特别是我想使用route功能返回URL，并传递照片的ID。

关于如何实现这一目标的任何想法？

Answer 1

我想出了一种方法。

为了将来任何人阅读的利益：

<?php

namespace App\Http\Controllers\Photos;

use App\Commands\Photos\UploadPhotoCommand;
use App\Http\Requests\Photos\UploadRequest;

class UploadController {

    public function process(UploadRequest $request)
    {
        // Initialise the command to a variable
        $command = new UploadPhotoCommand($request->file('photo'));

        try
        {
            // Dispatch the command
            $this->dispatch($command);
        }
        catch (\Exception $e)
        {
            \Log::error($e);
            return response()->json(['errors' => 'Sorry, something went wrong, please try again later.']);
        }

        // Grab the data from the command (Command handler sets it)
        echo $command->id;

        // I want to use the ID of the uploaded photo here
        return response()->json(['success' => 'Photo uploaded successfully']);
    }

}

在命令处理程序中：

<?php namespace App\Handlers\Commands\Photos;

use App\Commands\Photos\UploadPhotoCommand;

class UploadPhotoCommandHandler {
    public function __construct() {}

    public function handle(UploadPhotoCommand $command)
    {
        // Handle your command

        // Set the ID on the command object
        $command->id = 123;
    }
}

在命令中：

<?php namespace App\Commands\Photos;

use App\Commands\Command;
use Symfony\Component\HttpFoundation\File\UploadedFile;

class UploadPhotoCommand extends Command {

    public $photo;

    // Declare a public property ID
    public $id;

    public function __construct(UploadedFile $photo)
    {
        $this->photo = $photo;
    }

}

如果有人知道更好的方法，请告诉我。

Answer 2

最直接的方法是在UploadPhotoCommand类中进行单独的函数调用，而不是在构造函数中执行。

此函数调用返回包含所需内容的响应。

也就是说，您可以执行以下操作：

 public function process(UploadRequest $request)
{
    try
    {
        $oPhotoUploadTask = new UploadPhotoCommand();
        $results = $oPhotoUploadTask->uploadPhoto($request->file('photo'));
    }
    catch (\Exception $e)
    {
        \Log::error($e);
        return response()->json(['errors' => 'Sorry, something went wrong, please try again later.']);
    }

    // I want to use the ID of the uploaded photo here
    return response()->json(['success' => 'Photo {$results['photo_id']} uploaded successfully']);
}