rails helper 方法如何:attribute_changed?在 Rails 3.2.15 中工作? [英] How does rails helper method :attribute_changed? works in Rails 3.2.15?

问题描述

这是我的情况我需要:如果用户的电子邮件已更改，则生成用户确认码

Here is my situation I need: to generate user confirmation code if user's email have changed

我有型号:

class User < ActiveRecord::Base
...
  after_update :generate_confirm_code if :email_changed?
...
  def generate_confirm_code
    self.confirmation_code = SecureRandom.urlsafe_base64.first(8)
    self.confirmed = false
  end

  def update_last_visit
    self.last_visit = Time.now.utc
    save
  end
...
end

在 application_controller 中还有一个方法 :update_last_visit 可以保存用户上次访问的时间

also have a method :update_last_visit in application_controller which saves user last visit time

class ApplicationController < ActionController::Base
...
  def update_last_visit
    current_user.update_last_visit if current_user
  end
...
end

这里是问题开始:每次我重新加载页面时，我的确认码都会更改，即使我没有更改电子邮件.似乎更新 last_visit 也改变了 Confirmation_code 但为什么呢?

here is the problem starts: every time i reload the page my confirmation code changes, even when i did not change the email. Seems like updating last_visit also changes confirmation_code but why?

推荐答案

您的 after_update 宏的语法稍有错误.正如您现在所拥有的，if :email_changed? 实际上只是在加载 User 类时是否运行 after_update 宏的修饰符.IE.它与 puts "hi" if :some_condition? 相同(这里的 if 不是 puts 方法的输入).

You just have the syntax slightly wrong on your after_update macro. As you have it now, the if :email_changed? is actually just a modifier on whether or not to run the after_update macro when loading the User class. I.e. it's the same as puts "hi" if :some_condition? (the if is non an input to the puts method here).

您想要的是将 :if 选项传递给 after_update 宏，如下所示:

What you want is to pass an :if option to the after_update macro, like this:

after_update :generate_confirm_code, if: :email_changed?

请注意，if: 现在植根于 after_update 宏的选项哈希中.

Notice that the if: is now rooted in the options hash of the after_update macro.

另请参阅Rails 指南关于 ActiveRecord 回调.

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