authentication - Twig 中的 app.user.username 返回无法添加全局

Question

根据文档:

http://symfony.com/doc/current/book/security.html#retrieving-the-user-object

我正在尝试使用 twig 检查用户是否通过身份验证

当我放入 Twig 模板时:

{{ app.user.username }}

我收到错误

LogicException: Unable to add global "app" as the runtime or the extensions have already been initialized.

编辑:请按照下面的 composer.json 内容查找

{
    "name": "symfony/framework-standard-edition",
    "description": "The \"Symfony Standard Edition\" distribution",
    "autoload": {
        "psr-0": { "": "src/" }
    },
    "require": {
        "php": ">=5.3.3",
        "symfony/symfony": "2.1.*",
        "doctrine/orm": ">=2.2.3,<2.4-dev",
        "doctrine/doctrine-bundle": "1.0.*",
        "twig/extensions": "1.0.*@dev",
        "symfony/assetic-bundle": "2.1.*",
        "symfony/swiftmailer-bundle": "2.1.*",
        "symfony/monolog-bundle": "2.1.*",
        "sensio/distribution-bundle": "2.1.*",
        "sensio/framework-extra-bundle": "2.1.*",
        "sensio/generator-bundle": "2.1.*",
        "jms/security-extra-bundle": "1.2.*",
        "jms/di-extra-bundle": "1.1.*",
        "kriswallsmith/assetic": "1.1.*@dev",
        "doctrine/data-fixtures": "dev-master",
        "doctrine/doctrine-fixtures-bundle": "dev-master"
    },
    "scripts": {
        "post-install-cmd": [
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::clearCache",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installAssets",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installRequirementsFile"
        ],
        "post-update-cmd": [
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::clearCache",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installAssets",
            "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installRequirementsFile"
        ]
    },
    "extra": {
        "symfony-app-dir": "app",
        "symfony-web-dir": "web"
    }
}

Answer 1

如果没有更多细节，很难回答这个问题。

首先，请注意过去也有过类似的异常，由于 Symfony2.1最近版本已解决的错误:see here for more details .

然后，请注意错误似乎是在 addGlobal 中抛出的。类的函数Twig_Environment .你安装了这样的 Twig Extension 吗？

没有阅读您的 composer.json ，我可以建议尝试:

清除缓存。

更新 您的 composer.json 中的代码, 以避免出现最新的包。

创建 composer.phar .

然后编译得到composer.phar .

php composer.phar install或 php composer.phar update ，不管你是什么情况。

希望能帮助到你。