在 Laravel 中，如何将服务依赖注入到控制器方法中

Question

抱歉新手问题，但我找不到任何关于如何实际使用服务提供商的示例（Laravel 文档仅显示如何创建它们）。

由于 Laravel 的分页器不适用于分组，我想创建自己的分页器服务，但我不知道如何将所述服务注入控制器。论坛控制器抛出异常：Class App\Http\Controllers\CustomPaginator does not exist，但我认为如果我将服务 class 绑定到服务容器，它可以使用自定义名称解析吗？

文件如下：

app/Http/Controllers/For

<?php

namespace App\Http\Controllers;

use App\ForumModel;
use Illuminate\Http\Request;

class Forum extends Controller
{
    public function index($page = 1, CustomPaginator $paginator)
    {
        $topics = ForumModel::orderBy("sticky", "DESC")->orderBy("lastpost", "DESC");

        return view("forum", ["topics" => $topics]);
    }
}

app/Providers/CustomPaginatorServiceProvider.php

<?php

namespace App\Providers;

use Illuminate\Support\ServiceProvider;

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

    /**
     * Register the application services.
     *
     * @return void
     */
    public function register()
    {
        $this->app->bind("CustomPaginator", CustomPaginatorServiceProvider::class);
    }

    public function a()
    {
        echo "It works!";
    }
}

应用程序配置中的供应商table

'providers' => [

    /*
     * Laravel Framework Service Providers...
     */
    Illuminate\Auth\AuthServiceProvider::class,
    Illuminate\Broadcasting\BroadcastServiceProvider::class,
    Illuminate\Bus\BusServiceProvider::class,
    Illuminate\Cache\CacheServiceProvider::class,
    Illuminate\Foundation\Providers\ConsoleSupportServiceProvider::class,
    Illuminate\Cookie\CookieServiceProvider::class,
    Illuminate\Database\DatabaseServiceProvider::class,
    Illuminate\Encryption\EncryptionServiceProvider::class,
    Illuminate\Filesystem\FilesystemServiceProvider::class,
    Illuminate\Foundation\Providers\FoundationServiceProvider::class,
    Illuminate\Hashing\HashServiceProvider::class,
    Illuminate\Mail\MailServiceProvider::class,
    Illuminate\Notifications\NotificationServiceProvider::class,
    Illuminate\Pagination\PaginationServiceProvider::class,
    Illuminate\Pipeline\PipelineServiceProvider::class,
    Illuminate\Queue\QueueServiceProvider::class,
    Illuminate\Redis\RedisServiceProvider::class,
    Illuminate\Auth\Passwords\PasswordResetServiceProvider::class,
    Illuminate\Session\SessionServiceProvider::class,
    Illuminate\Translation\TranslationServiceProvider::class,
    Illuminate\Validation\ValidationServiceProvider::class,
    Illuminate\View\ViewServiceProvider::class,

    /*
     * Package Service Providers...
     */
    Laravel\Tinker\TinkerServiceProvider::class,

    /*
     * Application Service Providers...
     */
    App\Providers\AppServiceProvider::class,
    App\Providers\AuthServiceProvider::class,
    // App\Providers\BroadcastServiceProvider::class,
    App\Providers\EventServiceProvider::class,
    App\Providers\RouteServiceProvider::class,
    App\Providers\CustomPaginatorServiceProvider::class

],

Answer 1

不要在 CustomPaginatorServiceProvider

中绑定 CustomPaginatorServiceProvider

并绑定一个实例。

$this->app->bind('CustomPaginator', function () {
    return new Services\CustomPaginator();
});

创建服务提供商 CustomPaginatorServiceProvider
在应用程序配置中注册服务提供商CustomPaginatorServiceProvider
创建服务CustomPaginator
在 CustomPaginatorServiceProvider

service

CustomPaginator

顺便说一句，您可以在 AppServiceProvider 中绑定 service CustomPaginator 而不是创建新的 服务提供商

config/app.php 在别名数组中：

...
'CustomPaginator' => \App\Services\CustomPaginator::class,
...

内部控制器操作：

public function someAction(\CustomPaginator $paginator)
{
    dd($paginator);
}

如果您需要将一些数据传递到 CustomPaginator 方法 __construct - 只需在 ServiceProvider 中写入：

$this->app->bind(\App\Services\CustomPaginator::class, function () {
    return new \App\Services\CustomPaginator($firstParam, $secondParam, ...);
});

在 Laravel 中，如何将服务依赖注入到控制器方法中

In Laravel, how to depedency inject service into controller method

php

dependency-injection

service-provider

laravel