[Rails] initialization of new model objects in Rails

Hey guys... having an issue that hopefully someone can help with.

I have a ActiveRecord model called WebPage, it has two fields - url and title.  I want the title to be determined by parsing the html (I'm using Nokogiri) - and this is where I'm having issues.

My code looks something like:

class WebPage < ActiveRecord::Base

  attr_accessible :url, :title, :doc

  def doc

    @doc ||= Nokogiri::HTML(open(@url))

  end

  def title

    title = @doc.css('title')

  end

end

What is happening, is if I run this and try and create a new object (@page = WebPage.new(@url), I get:

ActionView::Template::Error (undefined method `css' for nil:NilClass)

Now, if I set @doc in my controller, and change the name of title to set_title and call @page.title = @page.set_title, it works.  But that is very ugly and if I've learned anything from rails, is that if it looks ugly to start with, it's probably not the right way.

What am I doing wrong?

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