# File lib/fog/network/openstack/requests/update_subnet.rb, line 5
        def update_subnet(subnet_id, options = {})
          data = {'subnet' => {}}

          vanilla_options = [:name, :gateway_ip, :allocation_pools,
                             :dns_nameservers, :host_routes, :enable_dhcp]
          vanilla_options.select { |o| options.key?(o) }.each do |key|
            data['subnet'][key] = options[key]
          end

          request(
            :body    => Fog::JSON.encode(data),
            :expects => 200,
            :method  => 'PUT',
            :path    => "subnets/#{subnet_id}"
          )
        end