new

# File activerecord/lib/active_record/associations/has_and_belongs_to_many_association.rb, line 7
      def initialize(owner, reflection)
        super
        if columns.size > 2
          ActiveSupport::Deprecation.warn "Having additional attributes on the join table of a has_and_belongs_to_many association is deprecated and will be removed in Rails 3.1. Please use a has_many :through association instead."
        end
      end