def validate_constraints(value)
      options.each do |option, arg|
        if validator_class = Respect.validator_for(option)
          validator_class.new(arg).validate(value)
        end
      end
    end
def validate_constraints(value)
      options.each do |option, arg|
        if validator_class = Respect.validator_for(option)
          validator_class.new(arg).validate(value)
        end
      end
    end
Validate all the constraints listed in +options+ to the
 given +value+.