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Semaphore名称的最大长度是多少?有一个是有道理的,因为它映射到底层内核信号量,但文档似乎没有准确地指定它。
信号量名称的最大长度为 260 个字符。超过此限制将导致ArgumentException并显示以下消息:
The name can be no more than 260 characters in length.
我们正在使用 Ruby on Rails(带有 MySQL 数据库的 Active Record)。
我们收到了这个神秘的错误:
undefined method `to_sym' for #<Arel::Attributes::At