Fog API Versioning

compute.rb

provider = attributes.delete(:provider).to_s.downcase.to_sym
version = attributes.delete(:version).to_s.downcase.to_sym

case provider
when :rackspace
  if version == :v2
    require 'fog/rackspace/compute/v2'
    Fog::Compute::Rackspace::V2.new(attributes)
  else
    require 'fog/rackspace/compute'
    Fog::Compute::Rackspace.new(attributes)
  end
end

example.rb

connection = Fog::Compute.new({
  :provider => 'Rackspace',
  :version => :v2
})