php - 在 Laravel 中，如何将服务依赖注入(inject)到 Controller 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者的示例(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(inject) Controller 。论坛 Controller 抛出异常:Class App\Http\Controllers\CustomPaginator does not exist，但我认为如果我将服务类绑定(bind)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!";
    }
}

应用配置中的提供商表

'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(bind) CustomPaginatorServiceProvider

并绑定(bind)一个实例。

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

1. 创建服务提供者 CustomPaginatorServiceProvider
2. 在应用程序配置中注册服务提供商 CustomPaginatorServiceProvider
3. 创建服务 CustomPaginator
4. 在CustomPaginatorServiceProvider
中绑定(bind) 服务 CustomPaginator

顺便说一句，您可以在 AppServiceProvider 中绑定(bind) service CustomPaginator 而不是创建新的 service provider

---

别名数组中的config/app.php:

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

内部 Controller Action :

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

如果您需要将一些数据传递给 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, ...);
});