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db.collection.aggregate([{$match:{"student_id":ObjectId("5fca683c239e4e2693ee20e4")}},{"$addFields":{"record_list":{"$filter":{"input":"$record_list","as":"rec","cond":{$eq:["$$rec.class_id","fa54389b-4504-465b-9c6c-a386918b8d67"]}}}}}])