class Measured::Length < Measured::Measurable conversion.set_base :m, aliases: [:meter, :metre, :meters, :metres] conversion.add :cm, aliases: [:centimeter, :centimetre, :centimeters, :centimetres], value: "0.01 m" conversion.add :mm, aliases: [:millimeter, :millimetre, :millimeters, :millimetres], value: "0.001 m" conversion.add :in, aliases: [:inch, :inches], value: "0.0254 m" conversion.add :ft, aliases: [:foot, :feet], value: "0.3048 m" conversion.add :yd, aliases: [:yard, :yards], value: "0.9144 m" end