在 Symfony 2 中分配全局 Twig 变量? [英] Assign a global Twig variable in Symfony 2?

问题描述

我的 Web 应用程序作为顶部栏，我需要在其中显示未读消息的数量.每个 User 实体都与 Message(多对多)关联.显示消息总数(对于给定用户)很简单:

My web application as a topbar where i need to display the number of unreaded messages. Each User entity as an association with Message (many-to-many). Showing the total number of messages (for a given user) would be simple:

class User
{
    /*
     * @ORM\ManyToMany(targetEntity="Message", invertedBy="users")
     */
    private $messages;
}

在树枝中:

Total messages: {{ app.user.messages|length }}.

但是如果我需要只计算新消息怎么办?假设我的存储库有一个 getNewMessages(User $user) 方法，如何全局分配此值以在每个模板中使用?

But what if i need to count only new messages? Assuming my repository has a getNewMessages(User $user) method, how can assign this value globally to use in every template?

我知道 Twig 全局变量，但我不知道应该把相关代码放在哪里:

I know about Twig globals, but i don't know where i'm supposed to put the relevant code:

$twig = new Twig_Environment($loader);
$twig->addGlobal('text', new Text());

{{ text.lipsum(40) }}

推荐答案

我会注册一个发生在每个请求上的事件监听器，可能是 kernel.request 事件.在侦听器中，您可以检查登录用户，如果是，则使用新消息计数更新会话变量.然后，您可以使用 app.session.msg_count

I would register an event listener that occurs on every request, probably the kernel.request event. In the listener you can check for a logged in user, and if so update a session variable with the new message count. You can then access this session variable in twig with app.session.msg_count

这也有一个好处，你可以缓存它并且只在特定条件下更新，以避免对每个请求进行查询.

This also has the advantage that you can cache it and only update under certain conditions, to avoid querying on every request.

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