我可以查询两次以获取mongoDB中更具体的值吗？

Question

For an example, there is a group called "A" which is an array.

And there is another group called "B" which is inside of group "A" also an array.

I want to find and update group "B" elements.

I tried to query chain-like query like in jQuery.

db.collection.findOne({"group":"A"}).findOne({"society":"B"})

something like this..

but this does not work. But main point is that I want to query group elements in group.

Any suggestion on doing this?

If you give me advice especially with PHP implementation, it will be really helpful

Answer 1

Maybe I am misunderstanding something, but what is wrong with:

db.collection.findOne({"group":"A", "society":"B"})

Also note that findOne only returns one document.