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Hello, I''m following a tutorial with a public controller, line_item model, and cart model. When I try to add an item to the cart I am getting an error NoMethodError in PublicController#add_to_cart You have a nil object when you didn''t expect it! You might have expected an instance of Array. The error occurred while evaluating nil.<< Here is my code

Hello there. I am following a tutorial with rails 2.1 and I have come across a problem where <%= f.label :artist_id %><br /> <%= f.select_tag(:artist_id, options_for_select([[''choose one'', '''']] + @artists.collect {|art| [art.name, art.id]}, @album.artist_id)) %> (Old artist info:<%= @album.artist_old%>) gives undefined method