Rails:更新模型属性而不调用回调 [英] Rails: Update model attribute without invoking callbacks

问题描述

我有一个具有 :credits 属性的 User 模型.我想要一个简单的按钮，通过名为add"的路由为用户的信用添加 5，以便/users/3/add 将向用户 id = 3 的信用添加 5.

I have a User model that has a :credits attribute. I want a simple button that will add 5 to the user's credits, through a route called "add" so that /users/3/add would add 5 to the credits of user id = 3.

def add
    @user = User.find(params[:id])
    @user.credits += 5
    redirect_to root_path
end

那是我的控制器的相关部分.问题是，我不想调用 @user.save 因为我有一个 before_save 回调，它根据当前的 UTC 时间重新加密用户的密码.只想简单的给属性加5，避免回调，没想到这么简单的事情这么难.

That is the relevant part of my controller. The problem is, I dont want to call @user.save because I have a before_save callback that re-encrypts the user's password based on the current UTC time. I just want to simply add 5 to the attribute and avoid the callback, I never thought such a simple thing could be so hard.

我将回调更改为:before_create，这是我的新控制器代码(相关部分):

I changed the callback to :before_create, here is my new controller code (relevant part):

  def add
    @user = User.find(params[:id])
    @user.add_credits(5)
    @user.save
    flash[:success] = "Credits added!"
    redirect_to root_path
  end

这是我在模型中的代码:

and here is my code in the model:

 def add_credits(num)
    self.credits = num
 end

编辑 2:

好吧，这是一个验证问题，导致EDIT"中的更改不起作用，但我仍然希望回答不带回调的原始更新问题！

Ok it was a validation problem that made the changes in "EDIT" not work, but I'd still love an answer to the original question of updating without callbacks!

推荐答案

Rails 3.1 引入了 update_column，与 update_attribute 相同，但不触发验证或回调:

Rails 3.1 introduced update_column, which is the same as update_attribute, but without triggering validations or callbacks:

http://apidock.com/rails/ActiveRecord/Persistence/update_column

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