什么样的异常是由ActiveRecord的::锁募集！？ [英] What kind of exception is raised by ActiveRecord::lock!?

问题描述

我使用的锁！在我的code和想赶异常，如果锁抛出！由于某种原因失败（如无法获得该锁）。什么样的异常可以锁定！扔？我查了红宝石文档，但无法找到具体的异常类。

I am using lock! in my code and want to catch the exception thrown if lock! fails for some reason (e.g. cannot get the lock). What kind of exceptions can lock! throw? I checked the ruby docs but couldn't find the specific Exception classes.

感谢。

推荐答案

下面是源的<一个href="https://github.com/rails/rails/blob/master/activerecord/lib/active_record/locking/pessimistic.rb"相对=nofollow>锁定电话。它要求重装及其来源是这样的：

Here is the source for that locking call. It calls reload and its source looks like this:

          # File lib/active_record/base.rb, line 2333
2333:       def reload(options = nil)
2334:         clear_aggregation_cache
2335:         clear_association_cache
2336:         @attributes.update(self.class.find(self.id, options).instance_variable_get('@attributes'))
2337:         @attributes_cache = {}
2338:         self
2339:       end

所以，当你调用重装。（：锁=>锁）的调用来锁定它是否真的更新该记录的属性

so when you call reload(:lock => lock) as the call to lock does it it really updating the attributes of that record.

有很多不同的情况在这里。你可以尝试锁定该dosnt存在的记录，或锁定一个已经在其他地方锁定。什么错误你有兴趣在追赶？

There are a lot of different situations here. You could try to lock a record that dosnt exist, or lock one that has been locked elsewhere. What error are you interested in catching?

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