MongoDB relationships: embed or reference?

Question

I\'m new to MongoDB--coming from a relational database background. I want to design a question structure with some comments, but I don\'t know which relationship to use for

Answer 1

I know this is quite old but if you are looking for the answer to the OP's question on how to return only specified comment, you can use the $ (query) operator like this:

db.question.update({'comments.content': 'xxx'}, {'comments.$': true})