[英]Node.JS Datastore Query get Key
How can I get the key of an entity returned by a query? 如何获取查询返回的实体的密钥?
I tried to access it like the normal data, but when I print the entity itself there is no key. 我试图像普通数据一样访问它,但是当我打印实体本身时没有密钥。 Is there even a way to do so? 有没有办法这样做?
Thank you in advance for your help. 预先感谢您的帮助。
Since version 0.5.0 of the @google-cloud/datastore v0.5.0 the key is now accesible by a Symbol. 从@ google-cloud / datastore v0.5.0版本0.5.0开始,密钥现在可由符号访问。
var datastore = require('@google-cloud/datastore')();
var query = datastore.createQuery('AnimalNamespace', 'Lion');
query.run(function(err, entities) {
var keys = entities.map(function(entity) {
// datastore.KEY is a Symbol
return entity[datastore.KEY];
});
});
You could also use the gstore-node library ( https://github.com/sebelga/gstore-node ) and then you would access it directly by entity.entityKey 您也可以使用gstore-node库( https://github.com/sebelga/gstore-node ),然后直接通过entity.entityKey访问它。
According to the documentation , datastore.runQuery
returns a entity objects, with the properties data
and key
. 根据文档 , datastore.runQuery
返回一个实体对象,其中包含属性data
和key
。 You are interested in key
. 你对key
感兴趣。
datastore.runQuery(query, function(err, entities) {
// entities = [
// {
// data: The record,
// key: The key for this record
// },
// ...
// ]
});
So, for example using the first entity, you would access the key like this: 因此,例如使用第一个实体,您可以像这样访问密钥:
entity = entities[0]
key = entity.key
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