O. Frabjous-Dey O. Frabjous-Dey - 8 months ago 33
Ruby Question

Using helpers in model: how do I include helper dependencies?

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.

The relevant parts of my model look like this:

include ActionView::Helpers::SanitizeHelper

class Post < ActiveRecord::Base {
before_validation :clean_input



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

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>

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?


Just change the first line as follows :

include ActionView::Helpers

that will make it works.

UPDATE: For Rails 3 use:


Credit goes to lornc's answer