[Rails] How to handle non model data in form?

Hey,

I got a form which looks like this:
- form_for(@article, :html => {:multipart => true}, :url =>
articles_path) do |f|
= errors_for(@article)

.field
= f.label :text
%br
= f.text_field :text

.field
= f.label :author_id
%br
= f.text_field :author_id

.actions
= f.submit

But since I don't want anyone to type in an author id I changed it to:
.field
= f.label :author_name
%br
= f.text_field :author_name

added to article.rb:
attr_accessible :author_name

def before_validation
if self.author_name
author_name = self.author_name.split
self.author =
Author.find_or_create_by_firstname_and_lastname(author_name[0],
author_name[1])
end

But now this line:
@article = Article.new(params[:article])
throws this error:
unknown attribute: author_name

I thought attr_accessible would cover that? How can I make this work?

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