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db.collection.aggregate([{$addFields:{days:{$dayOfWeek:{$toDate:"$created_at"}}}},{$group:{_id:{days:"$days"},totalReview:{$sum:"$views"},daysCount:{$sum:1}}},{$project:{_id:0,totalReview:1,day:{$switch:{branches:[{"case":{$eq:["$_id.days",1]},then:"sunday"},{"case":{$eq:["$_id.days",2]},then:"monday"},{"case":{$eq:["$_id.days",3]},then:"tuesday"},{"case":{$eq:["$_id.days",4]},then:"wednesday"},{"case":{$eq:["$_id.days",5]},then:"thursday"},{"case":{$eq:["$_id.days",6]},then:"friday"},{"case":{$eq:["$_id.days",7]},then:"saturday"}],"default":"day unknown"}}}}])