Question

假设我有两个模型都有相同的回调：

class Entry < ActiveRecord::Base
    belongs_to :patient
    validates :text, presence: true
    after_validation :normalizeDate

    def normalizeDate
      self.created_at = return_DateTime(self.created_at)
    end
end

class Post < ActiveRecord::Base
    after_validation :normalizeDate

    def normalizeDate
      self.created_at = return_DateTime(self.created_at)
    end
end

我可以在哪里放置共享回调代码？感谢

 def normalizeDate
   self.created_at = return_DateTime(self.created_at)
 end

Answer 1

马雷克的答案很好，但Rails方式是：

module NormalizeDateModule
  extend ActiveSupport::Concern

  included do
    after_validation :normalize_date
  end

  def normalize_date
    self.created_at = return_DateTime(created_at)
  end
end

Doc here

（你有一个假定的文件夹：模型/关注点）

Answer 2

您可以定义自己的模块：

module NormalizeDateModule
  def self.included(base)
    base.class_eval do
      after_validation :normalize_date
    end
  end

  def normalize_date
    self.created_at = return_DateTime(created_at)
  end
end

并将其包含在您希望此行为的每个类中：

class Entry < ActiveRecord::Base
  include NormalizeDateModule
  # ...
end

我不确定我的代码是否没有错误（我没有测试它），把它作为一个例子。

Answer 3

Rails 4方式是使用ActiveSupport::Concern

档案 models / concerns / date_normalizer.rb

module Concerns
  module DateNormalizer
    extend ActiveSupport::Concern

    included do |base|
      base.after_validation :normalize_date
    end

    def normalize_date
      self.created_at = return_DateTime(self.created_at)
    end
  end
end

文件 model / entry.rb

class Entry < ActiveRecord::Base
  include Concerns::DateNormalizer

  belongs_to :patient
  validates :text, presence: true
end

档案 models / post.rb

class Post < ActiveRecord::Base
  include Concerns::DateNormalizer
end

注意：我已将normalizeDate重命名为normalize_date

在哪里放置我在几个模型中使用的自定义回调

3 个答案: