gistfile1.rb

irb(main):010:0> @trip.stops
 ~ (0.000097) SELECT "id", "trip_id", "place_id" FROM "stops" WHERE "trip_id" = 19 ORDER BY "id"
=> [#<Stop @id=28 @trip_id=19 @place_id=28>, #<Stop @id=29 @trip_id=19 @place_id=29>, #<Stop @id=30 @trip_id=19 @place_id=30>]
irb(main):011:0> @trip.stops[-1..1]
=> []

#expected last 2:
=> [#<Stop @id=29 @trip_id=19 @place_id=29>, #<Stop @id=30 @trip_id=19 @place_id=30>]