什么样的对象db._collections（）返回ArangoDB？

Question

在Foxx上下文中，我正在使用数据库方法来访问arango db._collections()中的所有集合。返回值是一个数组。但是在数组中，每个“对象”不是字符串，不是数组，也不是对象。它们的类型是什么？

示例返回：

//This is 1 array. Correct
[ 
 //Each should be an array but they are not.
  [ArangoCollection 41, "_analyzers" (type document, status loaded)], 
  [ArangoCollection 38, "_appbundles" (type document, status loaded)], 
  [ArangoCollection 31, "_apps" (type document, status loaded)], 
  [ArangoCollection 14, "_aqlfunctions" (type document, status loaded)], 
  [ArangoCollection 4, "_graphs" (type document, status loaded)], 
  [ArangoCollection 20, "_jobs" (type document, status loaded)], 
  [ArangoCollection 17, "_queues" (type document, status loaded)], 
  [ArangoCollection 67, "_statistics" (type document, status loaded)], 
  [ArangoCollection 74, "_statistics15" (type document, status loaded)], 
  [ArangoCollection 60, "_statisticsRaw" (type document, status loaded)], 
  [ArangoCollection 7, "_users" (type document, status loaded)], 
  [ArangoCollection 95, "animals" (type document, status loaded)], 
  [ArangoCollection 89, "demo" (type document, status loaded)], 
  [ArangoCollection 73882, "example" (type document, status loaded)] 
]

Answer 1

db._collections()返回ArangoCollection对象的数组。您可以通过运行标准的JavaScript检查方法（例如Object.keys(...)）来查找此类对象，例如

obj = db._collections()[0]; 
Object.keys(obj).forEach(function(key) { 
  require("console").log(key + ' (' + typeof obj[key] + ')'); 
});