[/** by steevej*/{"time":1,"submitted":true},{"time":2,"submitted":true},{"time":3,"submitted":true},{"time":4,"submitted":false},{"time":5,"submitted":false},{"time":6,"submitted":false}]

db.collection.aggregate([{$set:{"_tmp.sort":{$cond:["$submitted",{"$multiply":["$time",-1]},"$time"]}}},{$sort:{"_tmp.sort":1}},{$unset:"_tmp"}])