“触摸"Rails 2.3.2 中的 updated_at 列 [英] "Touch" updated_at column in Rails 2.3.2

问题描述

我有一个过程，它遍历一堆 ActiveRecord 模型，进行一些处理，然后再次保存模型.但是，处理过程通常不会导致属性发生更改，因此 updated_at 列永远不会更改(即使调用了 save).

我不想禁用部分更新(通常，它们很有用).我猜我的两个选择是:

1. 向模型添加一个单独的时间戳列(即processed_at")并自己管理它，尽管这看起来有点浪费/冗余.
2. 或者以某种方式覆盖对 updated_at 属性的管理?

我听说 Rails 3 将有一个触摸"方法，这正是我正在寻找的.

任何想法/选项/意见?

解决方案

实际上是 touch 方法已经在 Rails 2.3.x 中了，所以你可以简单地做:

model.touch

更新updated_at 列.或者，使用当前日期和时间更新其他列:

model.touch(:column_name)

I have a process which iterates through a bunch of ActiveRecord models, does some processing, and saves the models again. Often though, the processing doesn't result in an changes to the attributes and so the updated_at column never changes (even though save is called).

I'd prefer not to disable partial updates (in general, they're useful). I'm guessing that my two options are to:

1. Add a separate timestamp column to the model (i.e., 'processed_at') and manage this myself, although this seems a bit wasteful/redundant.
2. Or somehow override the management of the updated_at attribute?

I've heard that Rails 3 will have a 'touch' method which would be exactly what I'm looking for.

Any ideas/options/opinions?

解决方案

Actually the touch method is already in Rails 2.3.x, so you can simply do:

model.touch

To update the updated_at column. Alternatively, to update some other column with the current date and time use:

model.touch(:column_name)

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