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db.collection.aggregate([{$project:{"Order_Details":{"$map":{"input":{"$objectToArray":{"$arrayToObject":{$map:{input:{"$zip":{"inputs":["$orderID","$total_value_of_order"]}},in:{k:{$toString:{"$arrayElemAt":["$$this",0]}},v:{"$arrayElemAt":["$$this",1]}}}}}},"as":"el","in":{"orderID":"$$el.v","total_value_of_order":"$$el.k"}}}}}])