Arangodb-使用Edge获得断言错误边缘._KEY等于

Question

我正在与arangodb和node.js一起工作。我正在尝试在DB中使用edgecollection。我已经从NPM下载了Arangojs并尝试了示例代码。

// ## Assigning the values
const arangojs = require('arangojs');
const aqlQuery = arangojs.aqlQuery;
const now = Date.now();
 //  ## Const variables for connecting to ArangoDB database
 const host = '192.100.00.000'
 const port = '8529'
 const username = 'xyz' 
 const password = 'XYZ'
 const path = '/_db/sgcdm_app/_api/'
 const database = 'sgcdm_app'
// ## Connection to ArangoDB
db = new arangojs.Database({
url: http://${host}:${port},
databaseName: database
});
db.useBasicAuth(username, password);
// ## Working with EDGES
const collection = db.edgeCollection('included_in');
const edge = collection.edge('included_in/595783');
const assert = require('assert');
// the edge exists
assert.equal(edge._key, '595783');
assert.equal(edge._id, 'included_in/595783');
console.log(db);

错误：

assert.js:42
throw new errors.AssertionError({
AssertionError [ERR_ASSERTION]: undefined == '595783'

Answer 1

如有记录， edgeCollection.edge()是 asynchronous ：https：//github.com/arangodb/arangojs#edgecollection

它返回 Promise ，而不是边缘：

collection.edge('included_in/595783');
Promise {
  <pending>,
  domain:
   Domain {
     domain: null,
     _events: { error: [Function: debugDomainError] },
     _eventsCount: 1,
     _maxListeners: undefined,
     members: [] } }

您必须 await结果或使用then()在结果后立即进行结果。

collection.edge('included_in/595783')
.then(res => { console.log("Key: " + res._key } ));
Key: 595783

您的断言是assert.equal(edge._key, '595783');，并且由于undefined == '595783'是错误的而失败。edge实际上是一个没有_key属性的承诺对象。因此，断言错误。

（GitHub问题的交叉点）