在日志中我看到一个 ROLLBACK ，但没有记录异常。有没有办法找出是什么原因造成的ROLLBACK？

下面是日志的摘录：

 手机负荷（0.4ms）选择电话。*从手机WHERE手机，ID= $ 1 LIMIT 1 [身份证，980190963]
   （为0.2ms）BEGIN
  用户负载（0.4ms）选择用户。*从用户WHERE的用户。phone_id= 980190963 LIMIT 1
   （为0.2ms）ROLLBACK
  电话负载（0.4ms）选择电话。*从手机WHERE手机，ID= $ 1 LIMIT 1 [身份证，980190963]
  用户负载（0.4ms）选择用户。*从用户WHERE的用户。phone_id= 980190963 LIMIT 1
 

解决方案

一种方式是手工信息写入日志。尝试像这样从你的控制器：

  Rails.logger.info（@ your_object.errors.inspect）
 

这应该输出所有失败验证的内容。

In the logs I'm seeing a ROLLBACK, but no exception is logged. Is there a way to find out what caused the ROLLBACK?

Here's the excerpt of the log:

  Phone Load (0.4ms)  SELECT "phones".* FROM "phones" WHERE "phones"."id" = $1 LIMIT 1  [["id", 980190963]]
   (0.2ms)  BEGIN
  User Load (0.4ms)  SELECT "users".* FROM "users" WHERE "users"."phone_id" = 980190963 LIMIT 1
   (0.2ms)  ROLLBACK
  Phone Load (0.4ms)  SELECT "phones".* FROM "phones" WHERE "phones"."id" = $1 LIMIT 1  [["id", 980190963]]
  User Load (0.4ms)  SELECT "users".* FROM "users" WHERE "users"."phone_id" = 980190963 LIMIT 1

One way is to manually write information to the log. Try something like this from your controller:

Rails.logger.info(@your_object.errors.inspect) 

That should output the content of all validations that failed.