ruby-on-rails - 跳过模型中的某些验证方法

Question

我正在使用 Rails v2.3

如果我有一个 型号 :

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

正如你在上面看到的，我有 3 种自定义验证方法 ，我将它们用于模型验证。

如果我在这个模型类中有另一种方法来保存模型的新实例，如下所示:

# "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

我想跳过 method_2 的验证在这种节省新车的特殊方法中， 如何跳过某些验证方法？

Answer 1

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 Controller 中输入:

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

如果您收到 :flag通过 Controller 中的 params 变量，您可以使用

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