我知道Rails 3.0.0 valids方法的文档在活动模型：：验证：：类方法
当时我想知道，从ActiveRecord:：Base继承的类是如何具有valides方法的？
例如，通常使用以下方式验证：
class User < ActiveRecord::Base
attr_accessible :name, :email
validates :name, :presence => true
end
我查看了类层次结构，它看起来像是SomeModelClass扩展了ActiveRecord:：Base延伸了对象
从ActiveRecord:：Base继承的模型对象如何使用Active：：Validations:：ClassMethods中的方法？
非常感谢你的帮助！
ActiveRecord:：Base调用Base.class_eval｛include Validation｝（以及其他一些include），这使得ActiveRecord:中的方法可以作为类宏使用。
这是实际的行：https://github.com/rails/rails/blob/master/activerecord/lib/active_record/base.rb#L306
你会在Rails上看到这种事情。
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