Controllers

• Introduction
• Writing Controllers
  • Basic Controllers
  • Single Action Controllers
• Controller Middleware
• Resource Controllers
  • Partial Resource Routes
  • Nested Resources
  • Naming Resource Routes
  • Naming Resource Route Parameters
  • Scoping Resource Routes
  • Localizing Resource URIs
  • Supplementing Resource Controllers
  • Singleton Resource Controllers
• Dependency Injection and Controllers

Introduction

Instead of defining all of your request handling logic as closures in your route files, you may wish to organize this behavior using "controller" classes. Controllers can group related request handling logic into a single class. For example, a UserController class might handle all incoming requests related to users, including showing, creating, updating, and deleting users. By default, controllers are stored in the app/Http/Controllers directory.

Writing Controllers

Basic Controllers

To quickly generate a new controller, you may run the make:controller Artisan command. By default, all of the controllers for your application are stored in the app/Http/Controllers directory:

php artisan make:controller UserController

Let's take a look at an example of a basic controller. A controller may have any number of public methods which will respond to incoming HTTP requests:

<?php

namespace App\Http\Controllers;

use App\Models\User;
use Illuminate\View\View;

class UserController extends Controller
{
    /**
     * Show the profile for a given user.
     */
    public function show(string $id): View
    {
        return view('user.profile', [
            'user' => User::findOrFail($id)
        ]);
    }
}

Once you have written a controller class and method, you may define a route to the controller method like so:

use App\Http\Controllers\UserController;

Route::get('/user/{id}', [UserController::class, 'show']);

When an incoming request matches the specified route URI, the show method on the App\Http\Controllers\UserController class will be invoked and the route parameters will be passed to the method.

[!NOTE]
Controllers are not required to extend a base class. However, it is sometimes convenient to extend a base controller class that contains methods that should be shared across all of your controllers.

Single Action Controllers

If a controller action is particularly complex, you might find it convenient to dedicate an entire controller class to that single action. To accomplish this, you may define a single __invoke method within the controller:

<?php

namespace App\Http\Controllers;

class ProvisionServer extends Controller
{
    /**
     * Provision a new web server.
     */
    public function __invoke()
    {
        // ...
    }
}

When registering routes for single action controllers, you do not need to specify a controller method. Instead, you may simply pass the name of the controller to the router:

use App\Http\Controllers\ProvisionServer;

Route::post('/server', ProvisionServer::class);

You may generate an invokable controller by using the --invokable option of the make:controller Artisan command:

php artisan make:controller ProvisionServer --invokable

[!NOTE]
Controller stubs may be customized using stub publishing.

Controller Middleware

Middleware may be assigned to the controller's routes in your route files:

Route::get('/profile', [UserController::class, 'show'])->middleware('auth');

Or, you may find it convenient to specify middleware within your controller class. To do so, your controller should implement the HasMiddleware interface, which dictates that the controller should have a static middleware method. From this method, you may return an array of middleware that should be applied to the controller's actions:

<?php

namespace App\Http\Controllers;

use Illuminate\Routing\Controllers\HasMiddleware;
use Illuminate\Routing\Controllers\Middleware;

class UserController extends Controller implements HasMiddleware
{
    /**
     * Get the middleware that should be assigned to the controller.
     */
    public static function middleware(): array
    {
        return [
            'auth',
            new Middleware('log', only: ['index']),
            new Middleware('subscribed', except: ['store']),
        ];
    }

    // ...
}

You may also define controller middleware as closures, which provides a convenient way to define an inline middleware without writing an entire middleware class:

use Closure;
use Illuminate\Http\Request;

/**
 * Get the middleware that should be assigned to the controller.
 */
public static function middleware(): array
{
    return [
        function (Request $request, Closure $next) {
            return $next($request);
        },
    ];
}

[!WARNING]
Controllers implementing Illuminate\Routing\Controllers\HasMiddleware should not extend Illuminate\Routing\Controller.

Resource Controllers

If you think of each Eloquent model in your application as a "resource", it is typical to perform the same sets of actions against each resource in your application. For example, imagine your application contains a Photo model and a Movie model. It is likely that users can create, read, update, or delete these resources.

Because of this common use case, Laravel resource routing assigns the typical create, read, update, and delete ("CRUD") routes to a controller with a single line of code. To get started, we can use the make:controller Artisan command's --resource option to quickly create a controller to handle these actions:

php artisan make:controller PhotoController --resource

This command will generate a controller at app/Http/Controllers/PhotoController.php. The controller will contain a method for each of the available resource operations. Next, you may register a resource route that points to the controller:

use App\Http\Controllers\PhotoController;

Route::resource('photos', PhotoController::class);

This single route declaration creates multiple routes to handle a variety of actions on the resource. The generated controller will already have methods stubbed for each of these actions. Remember, you can always get a quick overview of your application's routes by running the route:list Artisan command.

You may even register many resource controllers at once by passing an array to the resources method:

Route::resources([
    'photos' => PhotoController::class,
    'posts' => PostController::class,
]);

Actions Handled by Resource Controllers

Customizing Missing Model Behavior

Typically, a 404 HTTP response will be generated if an implicitly bound resource model is not found. However, you may customize this behavior by calling the missing method when defining your resource route. The missing method accepts a closure that will be invoked if an implicitly bound model cannot be found for any of the resource's routes:

use App\Http\Controllers\PhotoController;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Redirect;

Route::resource('photos', PhotoController::class)
    ->missing(function (Request $request) {
        return Redirect::route('photos.index');
    });

Soft Deleted Models

Typically, implicit model binding will not retrieve models that have been soft deleted, and will instead return a 404 HTTP response. However, you can instruct the framework to allow soft deleted models by invoking the withTrashed method when defining your resource route:

use App\Http\Controllers\PhotoController;

Route::resource('photos', PhotoController::class)->withTrashed();

Calling withTrashed with no arguments will allow soft deleted models for the show, edit, and update resource routes. You may specify a subset of these routes by passing an array to the withTrashed method:

Route::resource('photos', PhotoController::class)->withTrashed(['show']);

Specifying the Resource Model

If you are using route model binding and would like the resource controller's methods to type-hint a model instance, you may use the --model option when generating the controller:

php artisan make:controller PhotoController --model=Photo --resource

Generating Form Requests

You may provide the --requests option when generating a resource controller to instruct Artisan to generate form request classes for the controller's storage and update methods:

php artisan make:controller PhotoController --model=Photo --resource --requests

Partial Resource Routes

When declaring a resource route, you may specify a subset of actions the controller should handle instead of the full set of default actions:

use App\Http\Controllers\PhotoController;

Route::resource('photos', PhotoController::class)->only([
    'index', 'show'
]);

Route::resource('photos', PhotoController::class)->except([
    'create', 'store', 'update', 'destroy'
]);

API Resource Routes

When declaring resource routes that will be consumed by APIs, you will commonly want to exclude routes that present HTML templates such as create and edit. For convenience, you may use the apiResource method to automatically exclude these two routes:

use App\Http\Controllers\PhotoController;

Route::apiResource('photos', PhotoController::class);

You may register many API resource controllers at once by passing an array to the apiResources method:

use App\Http\Controllers\PhotoController;
use App\Http\Controllers\PostController;

Route::apiResources([
    'photos' => PhotoController::class,
    'posts' => PostController::class,
]);

To quickly generate an API resource controller that does not include the create or edit methods, use the --api switch when executing the make:controller command:

php artisan make:controller PhotoController --api

Nested Resources

Sometimes you may need to define routes to a nested resource. For example, a photo resource may have multiple comments that may be attached to the photo. To nest the resource controllers, you may use "dot" notation in your route declaration:

use App\Http\Controllers\PhotoCommentController;

Route::resource('photos.comments', PhotoCommentController::class);

This route will register a nested resource that may be accessed with URIs like the following:

/photos/{photo}/comments/{comment}

Scoping Nested Resources

Laravel's implicit model binding feature can automatically scope nested bindings such that the resolved child model is confirmed to belong to the parent model. By using the scoped method when defining your nested resource, you may enable automatic scoping as well as instruct Laravel which field the child resource should be retrieved by. For more information on how to accomplish this, please see the documentation on scoping resource routes.

Shallow Nesting

Often, it is not entirely necessary to have both the parent and the child IDs within a URI since the child ID is already a unique identifier. When using unique identifiers such as auto-incrementing primary keys to identify your models in URI segments, you may choose to use "shallow nesting":

use App\Http\Controllers\CommentController;

Route::resource('photos.comments', CommentController::class)->shallow();

This route definition will define the following routes:

Naming Resource Routes

By default, all resource controller actions have a route name; however, you can override these names by passing a names array with your desired route names:

use App\Http\Controllers\PhotoController;

Route::resource('photos', PhotoController::class)->names([
    'create' => 'photos.build'
]);

Naming Resource Route Parameters

By default, Route::resource will create the route parameters for your resource routes based on the "singularized" version of the resource name. You can easily override this on a per resource basis using the parameters method. The array passed into the parameters method should be an associative array of resource names and parameter names:

use App\Http\Controllers\AdminUserController;

Route::resource('users', AdminUserController::class)->parameters([
    'users' => 'admin_user'
]);

The example above generates the following URI for the resource's show route:

/users/{admin_user}

Scoping Resource Routes

Laravel's scoped implicit model binding feature can automatically scope nested bindings such that the resolved child model is confirmed to belong to the parent model. By using the scoped method when defining your nested resource, you may enable automatic scoping as well as instruct Laravel which field the child resource should be retrieved by:

use App\Http\Controllers\PhotoCommentController;

Route::resource('photos.comments', PhotoCommentController::class)->scoped([
    'comment' => 'slug',
]);

This route will register a scoped nested resource that may be accessed with URIs like the following:

/photos/{photo}/comments/{comment:slug}

When using a custom keyed implicit binding as a nested route parameter, Laravel will automatically scope the query to retrieve the nested model by its parent using conventions to guess the relationship name on the parent. In this case, it will be assumed that the Photo model has a relationship named comments (the plural of the route parameter name) which can be used to retrieve the Comment model.

Localizing Resource URIs

By default, Route::resource will create resource URIs using English verbs and plural rules. If you need to localize the create and edit action verbs, you may use the Route::resourceVerbs method. This may be done at the beginning of the boot method within your application's App\Providers\AppServiceProvider:

/**
 * Bootstrap any application services.
 */
public function boot(): void
{
    Route::resourceVerbs([
        'create' => 'crear',
        'edit' => 'editar',
    ]);
}

Laravel's pluralizer supports several different languages which you may configure based on your needs. Once the verbs and pluralization language have been customized, a resource route registration such as Route::resource('publicacion', PublicacionController::class) will produce the following URIs:

/publicacion/crear

/publicacion/{publicaciones}/editar

Supplementing Resource Controllers

If you need to add additional routes to a resource controller beyond the default set of resource routes, you should define those routes before your call to the Route::resource method; otherwise, the routes defined by the resource method may unintentionally take precedence over your supplemental routes:

use App\Http\Controller\PhotoController;

Route::get('/photos/popular', [PhotoController::class, 'popular']);
Route::resource('photos', PhotoController::class);

[!NOTE]
Remember to keep your controllers focused. If you find yourself routinely needing methods outside of the typical set of resource actions, consider splitting your controller into two, smaller controllers.

Singleton Resource Controllers

Sometimes, your application will have resources that may only have a single instance. For example, a user's "profile" can be edited or updated, but a user may not have more than one "profile". Likewise, an image may have a single "thumbnail". These resources are called "singleton resources", meaning one and only one instance of the resource may exist. In these scenarios, you may register a "singleton" resource controller:

use App\Http\Controllers\ProfileController;
use Illuminate\Support\Facades\Route;

Route::singleton('profile', ProfileController::class);

The singleton resource definition above will register the following routes. As you can see, "creation" routes are not registered for singleton resources, and the registered routes do not accept an identifier since only one instance of the resource may exist:

Singleton resources may also be nested within a standard resource:

Route::singleton('photos.thumbnail', ThumbnailController::class);

In this example, the photos resource would receive all of the standard resource routes; however, the thumbnail resource would be a singleton resource with the following routes:

Creatable Singleton Resources

Occasionally, you may want to define creation and storage routes for a singleton resource. To accomplish this, you may invoke the creatable method when registering the singleton resource route:

Route::singleton('photos.thumbnail', ThumbnailController::class)->creatable();

In this example, the following routes will be registered. As you can see, a DELETE route will also be registered for creatable singleton resources:

If you would like Laravel to register the DELETE route for a singleton resource but not register the creation or storage routes, you may utilize the destroyable method:

Route::singleton(...)->destroyable();

API 单例资源

apiSingleton 方法可用于注册将通过 API 操作的单例资源，从而不需要 create 和 edit 路由：

Route::apiSingleton('profile', ProfileController::class);

当然，API 单例资源也可以是 可创建的 ，它将注册 `store 和 destroy 资源路由：

Route::apiSingleton('photos.thumbnail', ProfileController::class)->creatable();

依赖注入和控制器

构造函数注入

Laravel 服务容器 用于解析所有 Laravel 控制器。因此，可以在其构造函数中对控制器可能需要的任何依赖项进行类型提示。声明的依赖项将自动解析并注入到控制器实例中：

<?php

namespace App\Http\Controllers;

use App\Repositories\UserRepository;

class UserController extends Controller
{
    /**
     * 创建新控制器实例。
     */
    public function __construct(
        protected UserRepository $users,
    ) {}
}

方法注入

除了构造函数注入，还可以在控制器的方法上键入提示依赖项。方法注入的一个常见用例是将 Illuminate\Http\Request 实例注入到控制器方法中：

<?php

namespace App\Http\Controllers;

use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;

class UserController extends Controller
{
    /**
     * 存储新用户。
     */
    public function store(Request $request): RedirectResponse
    {
        $name = $request->name;

        // 存储用户...

        return redirect('/users');
    }
}

如果控制器方法也需要路由参数，那就在其他依赖项之后列出路由参数。例如，路由是这样定义的：

use App\Http\Controllers\UserController;

Route::put('/user/{id}', [UserController::class, 'update']);

如下所示，你依然可以类型提示 Illuminate\Http\Request 并通过定义您的控制器方法访问 id 参数：

<?php

namespace App\Http\Controllers;

use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;

class UserController extends Controller
{
    /**
     * 更新给定用户。
     */
    public function update(Request $request, string $id): RedirectResponse
    {
        // 更新用户...

        return redirect('/users');
    }
}

dkp 翻译于 13小时前

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