How can I get only a specific array inside array of subdocuments?

[steevej (Steeve Juneau)]

As already mentioned in your other threads:

@steevej

The only way I know to project more element will be to use $filter within an aggregation pipeline.

And the link to $filter was already provided in one of your other threads:

@steevej

The other possible solution will involve a combination of

https://www.mongodb.com/docs/manual/reference/operator/aggregation/filter/

You need to aggregate starting with a $match stage that has the same query as your findOne().

You then need a $project stage that $filter the entries array using the username in the condition.