ActiveModel::MissingAttributeError 在部署后发生，一段时间后消失 [英] ActiveModel::MissingAttributeError occurs after deploying and then goes away after a while

问题描述

我有一个 Rails 3.0.9 应用程序，一旦部署，就会遇到一堆 ActiveModel::MissingAttributeErrors，导致 500 秒.错误发生相当随机，有时页面会加载，有时不会，但属性都是数据库中现有的属性，应该找到.

I have a Rails 3.0.9 app that, once it is deployed, suffers from a bunch of ActiveModel::MissingAttributeErrors that crop up causing 500s. The errors occur fairly randomly, sometimes a page will load, other times it won't, but the attributes are all existing attributes in the database and should be found.

奇怪的是，过了一会儿，错误就会消失.突然，它们不再引起问题.

The strange part is that after a while, the errors go away. Suddenly, they stop causing an issue.

我已经搜索了解决方案，但是当有人完成了 Model.all(:select => 'column_x,column_y') 并且正在调用 Model.all(:select => 'column_x,column_y')code>column_z 或当他们使用 cache_money 时.这些事情我都没有做.

I have searched about for a solution to this, but this error mostly occurs either when someone has done Model.all(:select => 'column_x,column_y') and are calling for column_z or when they are using cache_money. I am doing neither of these things.

有人可以帮忙吗?

推荐答案

您可能有一个查询没有返回所有列(即使用 :select)然后 cache_money;或其他一些 ActiveRecord 插件使用 after_initialize 回调，每当创建新的 ActiveRecord 对象时(即从数据库中获取时)都会执行该回调.

You probably have a query that doesn't return all the columns (i.e. uses :select) and then cache_money; or some other ActiveRecord plugin uses an after_initialize callback, which executes whenever a new ActiveRecord object is created (i.e. when fetched from the database).

在那个初始化回调中，某些东西试图访问或使用未包含在 :select 中的属性.您希望该属性为该属性返回 nil，但会抛出 ActiveRecord::MissingAttributeError.

In that initialize callback, something tries to access or use an attribute that wasn't included in the :select. You'd expect this to return nil for that attribute, but an ActiveRecord::MissingAttributeError is thrown instead.

您可以像文章建议的那样拯救 ActiveRecord::MissingAttributeError，或者在插件尝试访问或修改属性之前修补插件以使用 has_attribute?(:attribute_name).

You can rescue ActiveRecord::MissingAttributeError like the article suggests, or patch the plugin(s) to use has_attribute?(:attribute_name) before they try to access or modify the attribute.

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