instance method set_state

# File activerecord/lib/active_record/connection_adapters/abstract/transaction.rb, line 43
      def set_state(state)
        ActiveSupport::Deprecation.warn(<<-MSG.squish)
          The set_state method is deprecated and will be removed in
          Rails 6.0. Please use rollback! or commit! to set transaction
          state directly.
        MSG
        case state
        when :rolledback
          rollback!
        when :committed
          commit!
        when nil
          nullify!
        else
          raise ArgumentError, "Invalid transaction state: #{state}"
        end
      end