Scala MongoDB Driver does not find Objects

Question

In my Scala Application, I am trying to find() all Objects for a List of ObjectId s.
My DB Structure looks like that:

case class Parent(_id: ObjectId, name: String)
case class Child(_id: ObjectId, name: String, parents: List[ObjectId])

Now, I have a list of ParentIds and want to find all Parents.find(in("_id", foundChild.parents)) .

Unfortunately, parents will be empty. I have searched the Internet for a in("_id", List[ObjectId]) -Example, but couldn't find a single one.

Reading the documentation , it seems like it is not supported to check for lists, but only for TItem* . Is it possible to achieve a "is in List" Check somehow?

Answer 1

以varargs的形式传入List ：

Parents.find(in("_id", foundChild.parents: _*))