如何在Laravel 4中解决“目标[接口]不可实现”?

时间:2015-01-03 22:51:50

标签: php laravel laravel-4 inversion-of-control ioc-container

我的错误讯息:

Illuminate \ Container \ BindingResolutionException 
Target [Project\Backend\Service\Validation\ValidableInterface] is not instantiable.

我知道接口和抽象类不可实例化,所以我知道Laravel不应该尝试实例化我的接口。然而,不知怎的,它正在尝试并且我怀疑这可能是一个具有约束力的问题......即使我相信我已经正确绑定它并将其注册为服务提供商。

我应该提一下,我把这个例子从Chris Fidao"实施Laravel"它几乎相同!

这是我的表单类的前几行:

namespace Project\Backend\Service\Form\Job;

use Project\Backend\Service\Validation\ValidableInterface;
use Project\Backend\Repo\Job\JobInterface;

class JobForm {

    /**
     * Form Data
     *
     * @var array
     */
    protected $data;

    /**
     * Validator
     *
     * @var \Project\Backend\Form\Service\ValidableInterface
     */
    protected $validator;

    /**
     * Job repository
     *
     * @var \Project\Backend\Repo\Job\JobInterface
     */
    protected $job;

    public function __construct(ValidableInterface $validator, JobInterface $job)
    {
        $this->validator = $validator;
        $this->job = $job;
    }

这是我验证器类的前几行:

namespace Project\Backend\Service\Form\Job;

use Project\Backend\Service\Validation\AbstractLaravelValidator;

class JobFormValidator extends AbstractLaravelValidator {

    // Includes some validation rules

这是抽象验证器:

namespace Project\Backend\Service\Validation;

use Illuminate\Validation\Factory;

abstract class AbstractLaravelValidator implements ValidableInterface {

    /**
     * Validator
     *
     * @var \Illuminate\Validation\Factory
     */
    protected $validator;

    /**
     * Validation data key => value array
     *
     * @var Array
     */
    protected $data = array();

    /**
     * Validation errors
     *
     * @var Array
     */
    protected $errors = array();

    /**
     * Validation rules
     *
     * @var Array
     */
    protected $rules = array();

    /**
     * Custom validation messages
     *
     * @var Array
     */
    protected $messages = array();

    public function __construct(Factory $validator)
    {
        $this->validator = $validator;
    }

这是我将所有内容绑定到应用程序的代码:

namespace Project\Backend\Service\Validation;

use Illuminate\Support\ServiceProvider;
use Project\Backend\Service\Form\Job\JobFormValidator;

class ValidationServiceProvider extends ServiceProvider {

    public function register()
    {
        $app = $this->app;

        $app->bind('Project\Backend\Service\Form\Job\JobFormValidator', function($app)
        {
            return new JobFormValidator($app['validator']);
        });
    }
}

然后在app / config / app.php中注册:

.....
'Project\Backend\Service\Validation\ValidationServiceProvider',
....

最后这些是我控制器的前几行:

use Project\Backend\Repo\Job\JobInterface;
use Project\Backend\Service\Form\Job\JobForm;

class JobController extends \BaseController {

    protected $jobform;

    function __construct(JobInterface $job, JobForm $jobform)
    {
        $this->job = $job;
        $this->jobform = $jobform;
    }

2 个答案:

答案 0 :(得分:6)

当通过类型提示将它注入构造函数时,您需要告诉Laravel它应该用于某个接口的实例。

您可以使用bind()方法(例如,在您的服务提供商中)

执行此操作
$app->bind('JobInterface', 'Job'); // Job being the class you want to be used

我强烈建议你观看the video here,Laravel的创造者Taylor Otwell解释了这个以及其他一些事情。

答案 1 :(得分:1)

首先你需要使用

进行绑定

/app/Providers/AppServiceProvider.php

<?php namespace App\Providers;

use Illuminate\Support\ServiceProvider;

class AppServiceProvider extends ServiceProvider {

    /**
     * Bootstrap any application services.
     *
     * @return void
     */
    public function boot()
    {
        //
    }

    /**
     * Register any application services.
     *
     * @return void
     */
    public function register()
    {
        //
        $this->app->bind('JobInterface', 'Job');

    }

}

完成此更改后

运行composer update