Where is the best place to add methods to the Integer class in Rails?

Question

Where is the best place to add a method to the integer class in Rails? I\'d like to add a to_meters and to_miles methods.

Answer 1

Why not just:

class Feet
  def self.in_miles(feet)
    feet/5280
  end
end

usage:

Feet.in_miles 2313

Or maybe look at it the other way:

class Miles
  def self.from_feet(feet)
    feet/5280
  end
end

Miles.from_feet 2313