使用模型助手：我怎么有帮助的依赖？ [英] Using helpers in model: how do I include helper dependencies?

问题描述

我正在写一个处理从一个文本区域用户输入一个模型。继意见<一个href="http://web.archive.org/web/20090416200046/http://blog.caboo.se/articles/2008/8/25/sanitize-your-users-html-input">http://blog.caboo.se/articles/2008/8/25/sanitize-your-users-html-input,我清理输入模型保存到数据库中，使用before_validate回调之前。

I'm writing a model that handles user input from a text area. Following the advice from http://blog.caboo.se/articles/2008/8/25/sanitize-your-users-html-input, I'm cleaning up the input in the model before saving to database, using the before_validate callback.

我的模型的相关部分是这样的：

The relevant parts of my model look like this:

include ActionView::Helpers::SanitizeHelper

class Post < ActiveRecord::Base {
  before_validation :clean_input

  ...

  protected

  def clean_input
    self.input = sanitize(self.input, :tags => %w(b i u))
  end
end

不用说，这是行不通的。我收到以下错误，当我尝试和保存新帖子。

Needless to say, this doesn't work. I get the following error when I try and save a new Post.

undefined method `white_list_sanitizer' for #<Class:0xdeadbeef>

显然，SanitizeHelper创建HTML :: WhiteListSanitizer的实例，但是当我混合成我的模型无法找到HTML :: WhiteListSanitizer。为什么？我能做些什么这个解决？

Apparently, SanitizeHelper creates an instance of HTML::WhiteListSanitizer, but when I mix it into my model it can't find HTML::WhiteListSanitizer. Why? What can I do about this to fix it?

推荐答案

只要修改第一行，如下所示：

Just change the first line as follows :

include ActionView::Helpers

这会使它的工作原理。

更新：对于Rails 3中使用：

UPDATE: For Rails 3 use:

ActionController::Base.helpers.sanitize(str)

幸得 lornc的回答

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