def parse_hash
      direction = clause.values.first
      field = clause.keys.first.to_s
      ["$order_by", ["$#{direction}", field]]
    end
def parse_hash
      direction = clause.values.first
      field = clause.keys.first.to_s
      ["$order_by", ["$#{direction}", field]]
    end
Parses a hash clause

 * *Returns* :
   - A ReQON formatted array
 * *Examples* :
    @clause = { test: "asc"}
    @clause.parse
    => ["$order_by", ["$asc", "test"]]