Rails - Jul 2006 - sessions (newbie problem)

hi!

im implementing a login system for a messageboard. tooked from a book. 
pretty simple. everythings works great, but in the example the idea is, 
when i want to create a new message, the author name shall be tooked 
from the session[:user]

  def create
        params[:message][:date] = Time.now
	params[:message][:author_id] = @session[:user].id #here!!

	@message = Message.new(params[:message])
    if @message.save
      flash[:notice] = ''Message was successfully created.''
      redirect_to :action => ''list''
    else
      render :action => ''new''
    end
  end

but i recive this error:
"Called id for nil, which would mistakenly be 4 -- if you really wanted 
the id of nil, use object_id"

i dont know why, im following the example step by step. what can i do?

ty!!

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fixed!!

in the book was so: @session[:user].id

and i tried with:

@session[''user''].id

it works

ty anyway! :P

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