# File lib/fog/compute/openstack/requests/update_meta.rb, line 5
        def update_meta(collection_name, parent_id, key, value)
          request(
            :body    => Fog::JSON.encode('meta' => {key => value}),
            :expects => 200,
            :method  => 'PUT',
            :path    => "#{collection_name}/#{parent_id}/metadata/#{key}"
          )
        end