依赖注入Slim Framework 3 [英] Dependency Injection Slim Framework 3

问题描述

我正在使用Slim Framework 3创建API。该应用程序的结构为：MVCP（模型，视图，控制器，提供程序）。

I'm using Slim Framework 3 to create an API. The app structure is: MVCP (Model, View, Controller, Providers).

是否可以让Slim Dependency注入我所有的课程？

I我正在使用作曲家自动加载我所有的依赖项。

I'm using composer to autoload all my dependencies.

我的目录结构如下：

/app
   - controllers/
   - Models/
   - services/
   index.php
/vendor
 composer.json

这是我的 composer.json 文件。

{
  "require": {
    "slim/slim": "^3.3",
    "monolog/monolog": "^1.19"
  },
  "autoload" : {
    "psr-4" : {
        "Controllers\\" : "app/controllers/",
        "Services\\" : "app/services/",
        "Models\\" : "app/models/"
    }
  }
}

这是我的 index.php 文件。同样，依赖关系由作曲家自动注入

Here's my index.php file. Again, the dependencies are being auto injected by composer

<?php
use \Psr\Http\Message\ServerRequestInterface as Request;
use \Psr\Http\Message\ResponseInterface as Response;

require '../vendor/autoload.php';

$container = new \Slim\Container;
$app = new \Slim\App($container);

$app->get('/test/{name}', '\Controllers\PeopleController:getEveryone');

$app->run();

我的控制器看起来像这样

My controller looks like this

<?php #controllers/PeopleController.php

namespace Controllers;

use \Psr\Http\Message\ServerRequestInterface as Request;
use \Psr\Http\Message\ResponseInterface as Response;


class PeopleController
{
    protected $peopleService;

    protected $ci;
    protected $request;
    protected $response;

    public function __construct(Container $ci, PeopleService $peopleService)
    {
        $this->peopleService = $peopleService;
        $this->ci = $ci;
    }

    public function getEveryone($request, $response)
    {
        die($request->getAttribute('name'));

        return $this->peopleService->getAllPeoples();
    }
}

我的PeopleService文件如下：

My PeopleService file looks like this:

<?php

namespace Services;

use Model\PeopleModel;
use Model\AddressModel;
use Model\AutoModel;


class PeopleService
{
    protected $peopleModel;
    protected $autoModel;
    protected $addressModel;

    public function __construct(PeopleModel $peopleModel, AddressModel $addressModel, AutoModel $autoModel)
    {
        $this->addressModel = $addressModel;
        $this->autoModel = $autoModel;
        $this->peopleModel = $peopleModel;
    }

    public function getAllPeopleInfo()
    {
        $address = $this->addressModel->getAddress();
        $auto = $this->autoModel->getAutoMake();
        $person = $this->peopleModel->getPeople();

        return [
            $person[1], $address[1], $auto[1]
        ];
    }
}

Models / AddressModels.php

<?php

namespace Model;

class AddressModel
{

    public function __construct()
    {
        // do stuff
    }

    public function getAddress()
    {
        return [
            1 => '123 Maple Street',
        ];
    }
}

Models / AutoModel.php

namespace Model;

class AutoModel
{

    public function __construct()
    {
        // do stuff
    }

    public function getAutoMake()
    {
        return [
            1 => 'Honda'
        ];
    }
}

Models / PeopleModel.php

<?php
namespace Model;

class PeopleModel
{

    public function __construct()
    {
        // do stuff
    }

    public function getPeople()
    {
        return [
            1 => 'Bob'
        ];
    }

}

错误
我现在遇到以下错误：

ERROR I'm getting the following error now:

PHP Catchable fatal error:  Argument 2 passed to Controllers\PeopleController::__construct() must be an instance of Services\PeopleService, none given, called in /var/www/vendor/slim/slim/Slim/CallableResolver.php on line 64 and defined in /var/www/app/controllers/PeopleController.php on line 21

问题
如何依赖注入所有类？有没有办法自动告诉Slim的DI容器来做到这一点？

THE QUESTION How do I dependency inject all my classes? Is there a way to automagically tell Slim's DI Container to do it?

推荐答案

当您在可调用路线中引用一个类时，Slim会询问DIC。如果DIC没有该类名称的注册，则它将实例化该类本身，并将容器作为该类的唯一参数传递。

When you reference a class in the route callable Slim will ask the DIC for it. If the DIC doesn't have a registration for that class name, then it will instantiate the class itself, passing the container as the only argument to the class.

因此，要为您的控制器注入正确的依赖项，只需创建自己的DIC工厂：

Hence, to inject the correct dependencies for your controller, you just have to create your own DIC factory:

$container = $app->getContainer();
$container['\Controllers\PeopleController'] = function ($c) {
    $peopleService = $c->get('\Services\PeopleService');
    return new Controllers\PeopleController($c, $peopleService);
};

当然，您现在需要PeopleService的DIC工厂：

Of course, you now need a DIC factory for the PeopleService:

$container['\Services\PeopleService'] = function ($c) {
    $peopleModel = new Models\PeopleModel;
    $addressModel = new Models\AddressModel;
    $autoModel = new Models\AutoModel;
    return new Services\PeopleService($peopleModel, $addressModel, $autoModel);
};

（如果PeopleModel，AddressModel或AutoModel具有依赖项，那么您也将为其创建DIC工厂。 ）

(If PeopleModel, AddressModel, or AutoModel had dependencies, then you would create DIC factories for those too.)

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