friends of friends in mongodb

Is there a way to do something like friends of friends in mongodb... In mysql it was

select friend_id from friends 开发者_StackOverflow社区where user_id IN (select friend_id from friends where user_id = id)`

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You have to perform multiple queries unless you are able to store your data as nested data structure inside one document

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embeds friendship?

and in your friendship model have a friender and a friendee with request and accept date.