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I have to << search for each problems.room_id=rooms.id and do problems.room_no=rooms.room >> HOW? More details: I have the following tables: - a "rooms" table, with fields (id,room,create...) - a "problems" table with fields (id,room_id,room_no, ...) problem.rb has belongs_to :room validates_associated :room and room.rb has validates_length_of :room,