QueryResults is a special case Array with additional values. A QueryResults object is returned from Gcloud::Datastore::Dataset#run and contains the Entities from the query as well as the query's cursor and #more_results value.

entities = dataset.run query
entities.size #=> 3
entities.cursor #=> "c3VwZXJhd2Vzb21lIQ"

Please be cautious when treating the QueryResults as an Array. Many common Array methods will return a new Array instance.

entities = dataset.run query
entities.size #=> 3
entities.end_cursor #=> "c3VwZXJhd2Vzb21lIQ"
names = entities.map { |e| e.name }
names.size #=> 3
names.cursor #=> NoMethodError