— Depends on how you built your Database Controllers. He said forEach which assumes a loop. MongoDB is capable of that.
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You should try to minimize the amount of requests. So in this case I would gather all the user IDs and then do something like getUsersByIds. No clue how mongoose works though
— You can do that with ~5 users. but not with 100
— Also, you just want to fetch the roles only once
— If two users share a role, you have to fetch it twice.
— So before you retrieve the data, you should map the role IDs, then filter unique, and then get all with`Promise.all()`
— But I am certain, any proper db tooling should have an in operator.. Like SQL: select * from roles where id in [0,1,2,3,4]
select * from roles where id in [0,1,2,3,4]
— That's different use case.
— Why? you want to get all roles for a set of users
— What is the expected end result?
— I want to get userId and populate the other object with that.
— For each user.