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ruby-on-rails - Ruby on Rails：Fetch_values 回滚错误

问题描述

我已经将我的 Ruby 升级到 2.5，在纠正了许多依赖问题之后，我被困在了一个地方。调用了 save 方法来保存记录，但不知何故它现在不起作用并显示以下错误：

500 Internal Error
undefined method 'fetch_value' for #<Hash:0*0007e589e>
Did you mean fetch_values
             each_value:

早些时候，同样.save的工作非常好。

标签： ruby-on-railsruby

解决方案

I've seen the same exception before. In my case, some ActiveRecord models were marshaled via Marshal::dump and saved as binary stream. Then, Ruby and Rails were upgraded.

Afterwards, calling Marshal::load on the marshaled copies would retrieve them and object.class would show the right model's name, but accessing any attribute within would throw the same exception.

I had to clear the marshaled copies and generate new ones.

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