Laravel 5 - 接口不可实例化

php laravel laravel-5 repository-pattern laravel-ioc

2022-08-30 08:46:08

我知道这个问题被问了很多次，但没有一个答案对我有帮助。

我在 Laravel 5 中遇到异常

BindingResolutionException in Container.php line 785:
Target [App\Contracts\CustomModelInterface] is not instantiable.

我做了什么没有成功：

在提供商中注册App\Providers\AppRepositoryProviderapp.php
php artisan clear-compiled
如果我替换MyService中存储库上的接口，一切都可以正常工作，但我觉得这是错误的（它应该由IoC容器处理吗？

结构：

app
  - Contracts
    - CustomModelInterface.php
  - Models
    - CustomModel.php
  - Repositories
    - CustomModelRepository.php
  - Providers
    - AppRepositoryProvider.php
  - Services
    - MyService.php

App\Contracts\CustomModelInterface.php

<?php namespace App\Contracts;

interface CustomModelInterface {
    public function get();
}

App\Repositories\CustomModelRepository.php

<?php namespace App\Repositories;

use App\Contracts\CustomModelInterface;
use App\Models\CustomModel;

class CustomModelRepository implements CustomModelInterface {

    private $Model;

    public function __construct(CustomModel $model) {
        $this->Model = $model;
    }

    public function get() {
        return 'result';
    }
}

App\Services\MyService.php（在控制器和存储库之间保留业务逻辑/层）

<?php namespace App\Services;

use App\Contracts\CustomModelInterface;

class MyService {

    private $Model;

    public function __construct(CustomModelInterface $customModel) {
        $this->Model= $customModel;
    }

    public function getAll() {
        return $this->Model->get();
    }
}

App\Providers\AppRepositoryProvider.php

<?php namespace App\Providers;

use Illuminate\Support\ServiceProvider;

class AppRepositoryProvider extends ServiceProvider {

    public function boot() {}

    public function register() {
        $models = array(
            'CustomModel'
        );

        foreach ($models as $idx => $model) {
            $this->app->bind("App\Contracts\{$model}Interface", "App\Repositories\{$model}Repository");
        }
    }
}

我的控制器看起来像这样：

<?php namespace App\Http\Controllers;

use App\Services\MyService;

class SuperController extends Controller {

    private $My;

    public function __construct(MyService $myService) {
        $this->My = $myService;
    }

    public function getDetails() {
        return $this->My->getAll();
    }
}

composer.json

"autoload": {
        "classmap": [
            "database"
        ],
        "psr-4": {
            "App\\": "app/",
            "App\\Models\\": "app/Models/",
            "App\\Contracts\\": "app/Contracts/",
            "App\\Repositories\\": "app/Repositories/"
        }
    },

答案 1

谢谢大家，但问题出在我的AppRepositoryProvider中。由于它是绑定异常，因此显然问题在于绑定:)

正确的文件是：

<?php namespace App\Providers;

use Illuminate\Support\ServiceProvider;

class AppRepositoryProvider extends ServiceProvider {

    public function boot() {}

    public function register() {
        $models = array(
            'CustomModel',
            'CustomModel2',
            'CustomModel3'
        );

        foreach ($models as $model) {
            $this->app->bind("App\Contracts\\{$model}Interface", "App\Repositories\\{$model}Repository");
        }
    }
}

请注意，我正在使用（不转义“{”符号），并且它生成正确的字符串而不是（具有意外转义）。"App\Contracts\\{$model}Interface"App\Contracts\CustomModelInterfaceApp\Contracts\{$model}Interface

答案 2

每次我创建新的存储库/合约对时，我都要确保执行以下操作：

检查服务提供程序中使用的类（复制/粘贴命名空间）
在配置/应用中注册新绑定.php
php工匠优化

许多小时的无用调试使我找到了这个简短的清单。