从集合中获取 mongodb 文档，该集合具有引用其他集合的外键字段

Question

我正在从数据库中获取文档并使用 db[TABLE_NAME].find({}).limit(2) 但我也打算获取“userID”引用的外键中的文档

{
    "_id" : ObjectId("515f84883f71d6bcb1c41a55"),
    "home" : "somehome",
    "userID" : ObjectId("515f7db83f71d6bcb1c41a49")
}
{
    "_id" : ObjectId("515f84883f71d6bcb1c41a56"),
    "home2" : "somehome2",
    "userID" : "515f7db83f71d6bcb1c41a4a"
}
{
    "_id" : ObjectId("515f84883f71d6bcb1c41a54"),
    "home3" : somehome2,
    "userID" : "515f7db83f71d6bcb1c41a48"
}