什麼是使before_validation等工作在ActiveModel

Question

我應該擴展或包括ActiveModel:Validations:Callbacks:ClassMethods或ActiveModel:Validations:Callbacks？

Answer 1

我得到了它這樣的工作：

class Foo 
    extend ActiveModel::Callbacks 
    include ActiveModel::Validations 
    include ActiveModel::Validations::Callbacks 

    before_validation :bar 

    def bar 
    # callback logic here 
    end 
end 

，你必須按照這個順序一切是很重要的。