Let’s say you can clean up some queries. Use AREL’s magic by utilizing Rails’ arel_table method.

scope :ids_greater_than_five, -> {
  where(arel_table[:id].gt(5))
}

Or snipe queries without scopes!

per = Period.arel_table
Period.where(
              per[:id].gt(5).or(per[:id].eq(1))
            )

Do not forget: Scopes can make your code cleaner and easier to maintain.