Rails - Jan 2008 - Problem with session

Hi,
I have problem when i tried to logging logging successfull,
but when tried to find out the current cuser details by session it
always says nil

code for loging:-

 @user = User.new(params[:user])
    #session[:user_id] = nil

    case request.method
    when :post

      respond_to do |format|
        if @current_user = User.authenticate(@user.email, params[:user]
[:hashed_password])
          session[:user_id] = @current_user.id
          flash[:notice] = "user login successfully !!!"
          format.html { redirect_to(users_path) }
        else
          flash[:notice] = " better try next time !!!"
          format.html { render :action => "index" }
        end

i want to fetch user details from user table by from user controller
Couldn''t find User with ID=2

but the current user id is not  2, it always take id  2
code:-
@user=User.find(session[:user_id])


Thank''s
ajit
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