expire

# File activerecord/lib/active_record/connection_adapters/abstract_adapter.rb, line 329
      def expire(update_idle = true) # :nodoc:
        if in_use?
          if @owner != ActiveSupport::IsolatedExecutionState.context
            raise ActiveRecordError, "Cannot expire connection, "                "it is owned by a different thread: #{@owner}. "                "Current thread: #{ActiveSupport::IsolatedExecutionState.context}."
          end

          _run_checkin_callbacks do
            @idle_since = Process.clock_gettime(Process::CLOCK_MONOTONIC) if update_idle
            @owner = nil
            enable_lazy_transactions!
            unset_query_cache!
          end
        else
          raise ActiveRecordError, "Cannot expire connection, it is not currently leased."
        end
      end