铁轨中的虫子?关于继承的模型
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28-09-2019 - |
题
My env: ruby-1.9.2-preview3; rails-3.0.0.beta3
class PostFather < ActiveRecord::Base
def self.inherited(subclass)
end
end
class Post < PostFather
end
在控制台中:
> Post.new # => TypeError: can't dup NilClass
> Post.all # => TypeError: can't dup NilClass
> Post.scoped # => TypeError: can't dup NilClass
你可以自己尝试;
解决方案
ActivereCord正在使用继承的方法,您需要调用Super,因此ActivereCord仍然运行:
class PostFather < ActiveRecord::Base
def self.inherited(subclass)
super(subclass)
end
end
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