如何在 symfony 2 中声明一个助手 [英] How to declare an helper in symfony 2

问题描述

我想在我的应用程序中使用自定义帮助程序.

I would like to use a custom helper in my application.

我在 Bundle/Helper/Myhelper.php 中创建了 Myhelper.php 文件

I created the file Myhelper.php in Bundle/Helper/Myhelper.php with

namespace Project\Bundle\Helper;

class Myhelper {

    public function __construct($doctrine) {

        $this->doctrine = $doctrine;

    }

    function testMyHelper () {

        return "hi";

    }

}

我试图在我的控制器中调用它:

And I tried to call it in my controller:

$myHelper = $this->get('Myhelper');

但我有以下错误:

在渲染模板期间抛出异常(您请求了一个不存在的服务myhelper".")

An exception has been thrown during the rendering of a template ("You have requested a non-existent service "myhelper".")

我必须在特定的配置文件中声明它吗?

Must I declare it in a specific config file ?

谢谢

推荐答案

当你调用 $controller->get($id) 函数时，它指的是由给定的 $ 注册的服务id.如果你想在控制器中使用这个助手，你需要在 service.yml 文件(或 xml、php，无论你使用什么用于服务声明)中将它注册为服务

When you call $controller->get($id) function it refers to a service registered by given $id. If you want to use this helper in a controller you need to register it as a service in service.yml file (or xml, php, whatever you use for service declarations)

# app/config/services.yml
services:
    app.helpers.my_helper: # the ID of the service user to get id
        class:        Project\Bundle\Helper\MyHelper
        arguments:    ['@doctrine']

然后你可以调用$this->get('app.helpers.my_helper');来获取服务实例.

Then you can call $this->get('app.helpers.my_helper'); to get the service instance.

如果你不想在控制器中而是在 twig 中使用它，你需要将它作为 twig 扩展注入并通过依赖注入注入你的服务:

If you want to use it not in controller but also in twig, you need to inject it as a twig extension and inject your service through dependency injection:

# app/config/services.yml
services:
    app.twig_extension:
        class: AppBundle\Twig\AppExtension
        public: false
        arguments: ['@app_helpers.my_helper']
        tags:
            - { name: twig.extension }

您可以在 symfony 服务容器文档 和 Twig 扩展文档

You can read more about this in symfony Service container documentation and Twig extension documentation

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