materialize_transactions

# File activerecord/lib/active_record/connection_adapters/abstract/transaction.rb, line 239
      def materialize_transactions
        return if @materializing_transactions
        return unless @has_unmaterialized_transactions

        @connection.lock.synchronize do
          begin
            @materializing_transactions = true
            @stack.each { |t| t.materialize! unless t.materialized? }
          ensure
            @materializing_transactions = false
          end
          @has_unmaterialized_transactions = false
        end
      end