如何实现类似于“自动插入时间戳"的功能? [英] How can I achieve a functionality similar to "auto-insertion of timestamps"

问题描述

在我的大多数表格中，我有几个字段 created_by 和 updated_by.这将包含创建或更新对象的用户的用户 ID.是否有可能具有类似 rails 如何处理 created_at 的功能?我基本上希望它的功能与时间戳插入相同.我应该能够在迁移脚本的列中定义并配置 rails 以在每次更改特定对象时从辅助方法中获取用户对象.有没有直接的方法来做到这一点，或者是否有一个插件可以做到这一点?

I have a couple of fields created_by and updated_by in most of my tables. This would contain the user id of the user who created or updated the Object. is it possible to have a similar function like how rails handles created_at? I basically want it to function the same way as the timestamps insertion. I should be able to define in the columns in the migration script and configure rails to fetch the user object from a helper method everytime when it changes the particular object. Is there a direct way to do it or is there a plugin which does this?

推荐答案

你也可以在没有 gem 的情况下做到这一点，但使用 Rails 观察者

Also you can do this without gems but with Rails Observers

您可以像这样创建观察者:

You can create observer like this:

class UserTouchObserver < ActiveRecord::Observer
  observe :product, :post, :comment

  def after_create(model)
    update_attribute(:created_by, current_user.id) if model.respond_to?(:created_by)
  end

  def after_update(model)
    update_attribute(:updated_by, current_user.id) if model.respond_to?(:updated_by)
  end
end

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