如何在arangodb中从两个集合中获取数据

db._create("users");
db._create("orders");

db.users.save({ _key: "user1", name: "Alice", age: 30 });
db.users.save({ _key: "user2", name: "Bob", age: 25 });

db.orders.save({ _key: "order1", userId: "user1", product: "Laptop", price: 1000 });
db.orders.save({ _key: "order2", userId: "user2", product: "Phone", price: 500 });

FOR order IN orders
  LET user = (
    FOR u IN users
      FILTER u._key == order.userId
      RETURN u
  )[0]
  RETURN { order, user }

[
  {
    "order": {
      "_key": "order1",
      "userId": "user1",
      "product": "Laptop",
      "price": 1000
    },
    "user": {
      "_key": "user1",
      "name": "Alice",
      "age": 30
    }
  },
  {
    "order": {
      "_key": "order2",
      "userId": "user2",
      "product": "Phone",
      "price": 500
    },
    "user": {
      "_key": "user2",
      "name": "Bob",
      "age": 25
    }
  }
]