Mongo query with aggregate function for rails

Group by state and created at:

   Mongo query to count no. of questions and votes by different gender with their total sum.

    group_by = if @filter[:by] == 'geolocation' 

        ({ "country_code": "$country_code", "state_code": "$state_code" })

      else

        ({ "day": {"$dayOfMonth": "$created_at"}, "month": {"$month": "$created_at"}, "year": {"$year": "$created_at"} })

      end

    data = Question.collection.aggregate([

        { "$match": 

          {

            "asked_to": @filter[:loggedin_user_id],

            "created_at": { "$gte": filter[:from_date], "$lt": filter[:to_date] }

          }

        },    

        { "$group": 

          { "_id": group_by, 

            "male": {"$sum":{"$cond":[{"$eq":["$asker_gender", "male"]},1,0]} },

            "female": {"$sum":{"$cond":[{"$eq":["$asker_gender", "female"]},1,0]}}, 

            "other": {"$sum":{"$cond":[{"$eq":["$asker_gender", "other"]},1,0]}}, 

            "total": {"$sum":1}, 

            "male_votes": {"$sum": {"$cond": [ { "$gte": [ "$asker_gender", "male" ] }, "$requestor_count", 0 ]}}, 

            "female_votes": {"$sum": {"$cond": [ { "$gte": [ "$asker_gender", "female" ] }, "$requestor_count", 0 ]}}, 

            "other_votes": {"$sum": {"$cond": [ { "$gte": [ "$asker_gender", "other" ] }, "$requestor_count", 0 ]}}, 

            "total_votes": {"$sum": "$requestor_count"} 

          }

        }

      ])