LookupResults is a special case Array with additional values. A LookupResults object is returned from Gcloud::Datastore::Dataset#find_all and contains the entities as well as the Keys that were deferred from the results and the Entities that were missing in the dataset.

entities = dataset.find_all key1, key2, key3
entities.size #=> 3
entities.deferred #=> []
entities.missing #=> []

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

entities = dataset.find_all key1, key2, key3
entities.size #=> 3
entities.deferred #=> []
entities.missing #=> []
names = entities.map { |e| e["name"] }
names.size #=> 3
names.deferred #=> NoMethodError
names.missing #=> NoMethodError