Question

我写这样的课：

class SERVICE
{
    public function __construct($a, UserRepository $repository) { 
        $this->repository = $repository; $this->relations = [ 
            [
                '\Api\Users\Models\Client', 'clients', '$a'
            ]
        ]; 
        $this->events = [ ]; 
    } 
    ... 
 }

我使用了这样的类：

use SERVICE; 

class TEST 
{ 
    public function __construct(SERVICE $service) 
    { 
        $this->service = $service; 
    } 
}

我有错误：

无法解析的依赖项解析[Parameter＃0 [$ a]]

如何以这种方式感应参数？

Answer 1

Laravel只能自动注入https://laravel.com/docs/5.5/container#automatic-injection。对于您来说，服务中的$a参数未定义类型。您必须是更改或服务__construct或Test类。例如

use SERVICE; 

class TEST 
{ 
    public function __construct(UserRepository $repository) { 
        $this->service = new Service('some-value', $repository);
    }
}

或更改服务

class SERVICE
{
    public function __construct(UserRepository $repository) { 
        $this->repository = $repository;  
        $this->events = [ ]; 
    } 

    public function setRelations($a) 
    {
         $this->relations = [ 
            [
                '\Api\Users\Models\Client', 'clients', '$a'
            ]
        ];
    }
    ... 
 }

和用法

use SERVICE; 

class TEST 
{ 
    public function __construct(SERVICE $service) 
    { 
        $this->service = $service;
        $this->service->setRelations('some-value'); 
    } 
}

通过参数来构造

1 个答案: