code: def default_get(self, fields):
          
          if self._context is None:
              self._context = {}
          res = super(RoomReservationSummary, self).default_get(fields)
          # Added default datetime as today and date to as today + 30.
          from_dt = datetime.today()
          dt_from = from_dt.strftime(dt)
          to_dt = from_dt + relativedelta(days=30)
          dt_to = to_dt.strftime(dt)
          res.update({'date_from': dt_from, 'date_to': dt_to})
  
          if not self.date_from and self.date_to:
              date_today = datetime.datetime.today()
              first_day = datetime.datetime(date_today.year,
                                            date_today.month, 1, 0, 0, 0)
              first_temp_day = first_day + relativedelta(months=1)
              last_temp_day = first_temp_day - relativedelta(days=1)
              last_day = datetime.datetime(last_temp_day.year,
                                           last_temp_day.month,
                                           last_temp_day.day, 23, 59, 59)
              date_froms = first_day.strftime(dt)
              date_ends = last_day.strftime(dt)
              res.update({'date_from': date_froms, 'date_to': date_ends})
          return res
docs: To get default values for the object.
          @param self: The object pointer.
          @param fields: List of fields for which we want default values
          @return: A dictionary which of fields with values.