[{"username":"ali","email":"ali200@gmail.com","password":"pdcjjfefmkadjakefkeofjafjafsfjsalnnryifajs","friends":[{"id":"1","username":"gamal","approved":true},{"id":"2","username":"osama","approved":false},{"id":"3","username":"john","approved":true}]},{"username":"ali2","email":"ali2002@gmail.com","password":"pdcjjfefmkadjakefkeofjafjafsfjsalnnryifajs","friends":[{"id":"1","username":"gamal","approved":true},{"id":"2","username":"osama","approved":false},{"id":"3","username":"john","approved":true}]}]

db.collection.aggregate([{"$match":{email:"ali200@gmail.com"}},{$project:{_id:0,friends:{$filter:{input:"$friends",as:"truelyFriend",cond:{$eq:["$$truelyFriend.approved",true]},}}}}])