def valued_parameters
      @valued_parameters ||= filter_parameters.select do |key,value|
        # :order is special, it must always be excluded
        key.to_sym != :order && valued_parameter?(key,value)
      end
    end
def valued_parameters
      @valued_parameters ||= filter_parameters.select do |key,value|
        # :order is special, it must always be excluded
        key.to_sym != :order && valued_parameter?(key,value)
      end
    end
Values in the parameter list which are not blank, and not
 an ordering. That is, parameters which will be used to generate
 the filter expression.