Find embedded document by id in Mongoid

Question

how can I find embedded document by _id in mongoid? I have Childrens embedded Parent and I want to find one by its id:

Parent.where('children._id' => BSON::ObjectId(children_id).first

But this is returning a Parent containing the Children of given ID, not the Children itself.

Thanks

Answer 1

如果您已经有父母-只需遍历并在children数组中搜索孩子

children = parent.children.select {|child| child._id == children_id }