` event.where(“开始时间>=”?“,datetime.now)`不起作用

我正在将对重复事件的支持添加到我的rails应用程序中。 其中一个功能是 recurring_event.delete_this_and_following

应用程序/模型/重复事件.rb

   16 class RecurringEvent < ApplicationRecord
   17   belongs_to :event

   32   def delete_this_and_following
   33     event.recurring_events.where("start_time >= ?", start_time).destroy_all
   34   end

不幸的是,这给了我一个错误:

(byebug) event.recurring_events.where("start_time >= ?", start_time).size
*** ActiveRecord::StatementInvalid Exception: PG::InFailedSqlTransaction: 
ERROR:  current transaction is aborted, commands ignored until end 
of transaction block
: SELECT COUNT(*) FROM "recurring_events" 
WHERE "recurring_events"."event_id" = $1 AND 
(start_time >= '2018-10-23 10:42:50.281315')

nil

开始日期格式错误吗? start_time.to_s => "2018-10-23 11:24:59 UTC"