从 Symfony 表单中获取请求对象的最佳方法? [英] Best way to get request object from within Symfony forms?

问题描述

我使用 Symfony 和 Doctrine 为我的 CMS 生成表单.最近，我一直在通过基于特定 URL 参数设置默认值来自定义它们.

I use Symfony and Doctrine to generate forms for my CMSes. Lately I've been customizing them by setting default values based on specific URL parameters.

例如，我有两个模型:PollQuestion 和 PollChoice.PollChoice 通过 poll_question_id 字段与 PollQuestion 相关联.PollChoice 表单有一个下拉列表，其中列出了 PollChoice 可以附加到的所有可用 PollQuestion.我也有两条路线:pollchoices/new 和 poll/:poll_id/choice/new.两个路由都显示 PollChoiceForm，但是通过使用第二个路由，您将自动看到设置为 :poll_id URL 参数的 PollQuestion 下拉列表.为此，我通过从请求对象中获取 :poll_id 的值来简单地更改 PollChoiceForm 类中下拉小部件的默认值.

For example, I have two models: PollQuestion and PollChoice. PollChoice has a relation to PollQuestion by means of a poll_question_id field. The PollChoice form has a dropdown that lists all the available PollQuestions that the PollChoice can be attached to. I also have two routes: pollchoices/new and poll/:poll_id/choice/new. Both routes display the PollChoiceForm, but by using the 2nd route you would automatically see the PollQuestion dropdown set to the :poll_id URL parameter. I do this by simply changing the default value of the dropdown widget in the PollChoiceForm class by fetching the value of :poll_id from the request object.

我的问题有两个:

1) 我目前使用 sfContext::getInstance()->getRequest() 获取请求对象.我知道 sfContext::getInstance() 不受欢迎，但我一直无法找到另一种获取它的方法.还有其他方法吗?依赖注入似乎是一个不错的方法，但我不知道如何在不进行大量黑客攻击的情况下实现这一目标(我想避免这种情况).

1) I currently fetch the request object by using sfContext::getInstance()->getRequest(). I know that sfContext::getInstance() is frowned upon, but I haven't been able to find another way to fetch it. Is there another way? Dependency injection seems like a good way to go, but I don't know how to accomplish that without doing a lot of hacking (which I'd like to avoid).

2) 根据 URL 参数更改表单默认值的方式是否完全错误?

2) Am I completely going about the wrong way of changing a form's default values based on URL parameters?

推荐答案

每当我需要表单中的上下文时，我都会通过构造函数注入来实现.

Whenever I need the context in a form, I'm doing it via constructor injection.

在行动中:

$this->form = new WhateverForm($whatever, array("context" => $this->getContext()));

形式:

$this->getOption("context");

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