[Rails] Can't mass-assign these protected attributes: tag_attributes

[Greg Ma]

Hi,
I added a textarea to my edit student form, to be able to add tags to
this student. I did the simple code below, and this is the error i get.
I can't see what i did wrong...

#Error message
Processing StudentsController#update (for 127.0.0.1 at 2010-02-14
10:13:22) [PUT]
  Parameters: {"commit"=>"Submit",
"authenticity_token"=>"PNvzBi6Ro1XJg0c6CfgKsEw+wfg6DwZfnV2FUpRgqPs=",
"id"=>"1", "student"=>{"full_name"=>"Gregory ", "cb_id"=>"68",
"tag_attributes"=>"greg,toto", "description"=>"voila une jolie
description"}}
  Student Columns (12.8ms)   SHOW FIELDS FROM `students`
  Student Load (0.3ms)   SELECT * FROM `students` WHERE (`students`.`id`
= 1)
WARNING: Can't mass-assign these protected attributes: tag_attributes


#Html form
<% form_for @student do |f| %>
  <%= f.error_messages %>
  <p>
    <%= f.label :cb_id %><br />
    <%= f.text_field :cb_id %>
  </p>
  <p>
    <%= f.label :full_name %><br />
    <%= f.text_field :full_name %>
  </p>
  <p>
    <%= f.label :description%><br />
    <%= f.text_area :description %>
  </p>
  <p>
  <%= text_area_tag "student[tag_attributes]" %>

  <p><%= f.submit "Submit" %></p>
<% end %>
#END


#Student Class
class Student < ActiveRecord::Base
  has_and_belongs_to_many :data_files
  has_and_belongs_to_many :tags

  attr_accessible :cb_id, :full_name, :description

  validates_uniqueness_of :cb_id

  def tag_attributes=(tags)
    splits = tags.split(',')
    splits.each do |tag|
      Tag.build(tag)
    end
  end
end
#END

Thanks for your help
Greg
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