跳过模型中的某些验证方法 [英] skip certain validation method in Model

问题描述

我使用的是 Rails v2.3

如果我有一个模型:

class car < ActiveRecord::Base

  validate :method_1, :method_2, :method_3

  ...
  # custom validation methods
  def method_1
    ...
  end

  def method_2
    ...
  end

  def method_3
    ...
  end
end

如上所示，我有 3 种自定义验证方法，我将它们用于模型验证.

As you see above, I have 3 custom validation methods, and I use them for model validation.

如果我在这个模型类中有另一个方法来保存模型的新实例，如下所示:

If I have another method in this model class which save an new instance of the model like following:

# "flag" here is NOT a DB based attribute
def save_special_car flag
   new_car=Car.new(...)

   new_car.save #how to skip validation method_2 if flag==true
end

我想在这个保存新车的特定方法中跳过method_2的验证，如何跳过某些验证方法?

I would like to skip the validation of method_2 in this particular method for saving new car, how to skip the certain validation method?

推荐答案

将您的模型更新为此

class Car < ActiveRecord::Base

  # depending on how you deal with mass-assignment
  # protection in newer Rails versions,
  # you might want to uncomment this line
  # 
  # attr_accessible :skip_method_2

  attr_accessor :skip_method_2 

  validate :method_1, :method_3
  validate :method_2, unless: :skip_method_2

  private # encapsulation is cool, so we are cool

    # custom validation methods
    def method_1
      # ...
    end

    def method_2
      # ...
    end

    def method_3
      # ...
    end
end

然后在您的控制器中输入:

Then in your controller put:

def save_special_car
   new_car=Car.new(skip_method_2: true)
   new_car.save
end

如果您通过控制器中的 params 变量获取 :flag，则可以使用

If you're getting :flag via params variable in your controller, you can use

def save_special_car
   new_car=Car.new(skip_method_2: params[:flag].present?)
   new_car.save
end

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