beta_class.rb

# I've got some classes:
class User < App
end

class Team < App
end

class Pet < App
end

# Some of them have beta equivalents:
class Beta::User < User
end

# How can I write a class method, `to_beta`?
module Beta
  def to_beta
    # if "Beta::#{class.name}" is defined:
    #   Beta::#{class.name}
    # else
    #   name
    # end
  end
end

App.send(:extend, Beta)

# This will let me do:
User.to_beta # Beta::User