扶手：更新模型属性，而不调用回调

问题描述

我有有一个用户模式：信用属性。我想要一个简单的按钮，将增加5到用户的学分，通过一个名为路线添加，使/用户/ 3 /加将增加5到用户ID的学分= 3。

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

这是我的控制器的相关部分。问题是，我不想叫@ user.save因为我有一个before_save回调重新加密基于当前UTC时间用户的密码。我只想简单地添加5属性，避免回调，我从来没有想到这么简单的事竟如此艰难。

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.

编辑：

我改变了回调：before_create，
这是我的新的控制器code（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

和这里是我的code模型：

and here is my code in the model:

 def add_credits(num)
    self.credits = num
 end

编辑2：

好吧，这是一个验证的问题，在编辑不行所做的更改，但我仍然爱一个答案，而不回调更新原来的问题！

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

的Rails 3.1中引入 update_column ，这是一样的 update_attribute ，但没有引发验证或回调：

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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