# File lib/glue/validation.rb, line 363
                def validate_inclusion(*params)
                        c = { 
                                :in => nil, 
                                :msg => N::Validation::Errors.no_inclusion, 
                                :allow_nil => false,
                                :on => :save 
                        }
                        c.update(params.pop) if params.last.is_a?(Hash)
                
                        unless c[:in].respond_to?('include?')
                                raise(ArgumentError, 
                                                'An object that responds to #include? must be supplied as the :in option')
                        end

                        for name in params
                                if c[:allow_nil]
                                        code = %{
                                                unless obj.#{name}.nil? or (#{c[:in].inspect}).include?(obj.#{name})
                                                        errors.add(:#{name}, '#{c[:msg]}')
                                                end;
                                        }
                                else
                                        code = %{
                                                unless (#{c[:in].inspect}).include?(obj.#{name})
                                                        errors.add(:#{name}, '#{c[:msg]}')
                                                end;
                                        }
                                end

                                __meta[:validations] << [code, c[:on]]
                        end                                                                                                                                                                                          
                end