Coming from the relational DB world, we identify objects by their relationships. A one-to-one relationship could be a person with an address. Modeling it in a relational database would most probably require two tables: a person and an address table with a foreign key person_id in the address table.
The perfect analogy in MongoDB would be two collections, person and address, looking like this:
> db.Person.findOne(){"_id" : ObjectId("590a530e3e37d79acac26a41"), "name" : "alex"}> db.Address.findOne(){"_id" : ObjectId("590a537f3e37d79acac26a42"),"person_id" : ObjectId("590a530e3e37d79acac26a41"),"address" : "N29DD"}
Now we can use the ...
