Laravel 5-接口不可实例化 [英] Laravel 5 - Interface is not instantiable

问题描述

我知道这个问题被问了很多遍了，但是没有一个答案对我有帮助.

I know that this question was asked so many times, but none of answers helped me.

我在Laravel 5中遇到异常

I'm getting exception in Laravel 5

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

我所做的没有成功的事情:

What I've done without success:

• 在app.php提供者中注册App\Providers\AppRepositoryProvider
• php artisan clear-compiled
• 如果我替换MyService中存储库上的接口，一切都会正常，但是我认为这是错误的(应该由IoC容器处理吗?).

• Register App\Providers\AppRepositoryProvider in app.php providers
• php artisan clear-compiled
• Everything works if I replace interfaces on repositories in MyService, but I feel that it's wrong (should it be handled by IoC container?).

结构:

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

App \ Contracts \ CustomModelInterface.php

App\Contracts\CustomModelInterface.php

<?php namespace App\Contracts;

interface CustomModelInterface {
    public function get();
}

App \ Repositories \ CustomModelRepository.php

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(保持业务逻辑/控制器和存储库之间的层)

App\Services\MyService.php (Keep business logic / layer between controller and repositories)

<?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

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");
        }
    }
}

我的控制器如下:

<?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

composer.json

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

推荐答案

谢谢大家，但是问题出在我的AppRepositoryProvider中.由于是绑定异常，所以显然问题出在绑定:)

Thank you everyone, but problem was in my AppRepositoryProvider. As it's binding exception, then obviously the problem was with binding :)

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，我使用的是"App\Contracts\\{$model}Interface"(不是转义"{"符号)，它会生成正确的字符串App\Contracts\CustomModelInterface而不是App\Contracts\{$model}Interface(带有意外转义).

Note, that I'm using "App\Contracts\\{$model}Interface" (not escaping "{" symbol) and it generate correct string App\Contracts\CustomModelInterface instead of App\Contracts\{$model}Interface (with unexpected escaping).

这篇关于Laravel 5-接口不可实例化的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！