伙计们,
一个人如何访问父实体?假设我有2种users
并说cars
...当按板查询类型cars
时,它将返回与该板匹配的所有实体。如何获得这些实体的祖先信息?如果我想获取返回的实体的父键怎么办?这可能吗?
我只能检索实体的示例
const query = datastoreClient.createQuery('cars')
.filter('plate', '=', 'ABC');
return datastoreClient.runQuery(query).then(function (entities) {
console.log(entities);
return entities;
});
输出:
[
[
{
"id": "2b49ca40-a5fb-11e7-ad5c-c95aa76161c6",
"plate": "ABC"
}
],
{
"moreResults": "NO_MORE_RESULTS",
"endCursor": "Cn0Sd2oWc35za2lsZnVsLWZyYW1lLTE4MDIxN3JdCxIFdXNlcnMiJDIxMmU2MTQwLWE1OTQtMTFlNy1iMGQ1LWUxNjBjMjA0NjI2MQwLEgRjYXJzIiQyYjQ5Y2E0MC1hNWZiLTExZTctYWQ1Yy1jOTVhYTc2MTYxYzYMGAAgAA=="
}
]
答案 0 :(得分:1)
在这里,您可以执行所需的Node.js代码:
const Datastore = require('@google-cloud/datastore');
const projectId = 'some-projectid'
// Creates a client
const datastore = new Datastore({
projectId: projectId,
});
const Query = datastore
.createQuery('cars')
.filter('plate', '=', 'some-plate-number')
datastore.runQuery(Query).then(results => {
// Task entities found.
const tasks = results[0];
console.log('Tasks:');
tasks.forEach(task => console.log(task));
输出:
任务:{车牌:'some-plate-number',[Symbol(KEY)]:车牌{ 命名空间:未定义, id:“儿童实体ID”, 种类:“汽车”, 父母: 密钥{ 命名空间:未定义, id:“父实体的id”, 种类:“用户”, 路径:[Getter]}, 路径:[Getter]}}