How can I get data with key

[JinHyung Kim via StackOverflow]

i answer my self

need datastoreClient.int(_id)

let query = datastoreClient.createQuery(keyName)
  .hasAncestor(datastoreClient.key([keyName, datastoreClient.int(_id)]))

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[Dan McGrath via StackOverflow]

Rather than doing a query, you should do a direct get on the entity.

var key = datastoreClient.key(['item', datastore.int('123124124234221')]);
datastoreClient.get(key, function(err, entity) {
  console.log(err || entity);
});

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