使用super with before_validation

Question

I have this code in my every model. 
Class people 
    def before_validation 
    @attributes.each do |key,value| 
     self[key] = nil if value.blank? 
    end 
    end 
end 

Now i want to put my loop in separate module. Like 
Module test 
    def before_validation 
    @attributes.each do |key,value| 
     self[key] = nil if value.blank? 
    end 
    end 
end 

And i want to call this before_validation this way 
Class people 
    include test 
    def before_validation 
    super 
    .....Here is my other logic part..... 
    end 
end 

Are there any way to do it like that in rails?? 

Answer 1

您可以设置多个方法来由before_validation回调调用。因此，不是直接定义before_validation，而是在验证之前传递想要调用的方法。

module Test 
    def some_test_before_validaiton_method 
    # do something 
    end 
end 

class People < ActiveRecord::Base 
    include Test 
    def people_before_validation_foo 
    #do something else 
    end 
    before_validation :some_test_before_validation_method 
    before_validation :people_before_validaiton_foo 
end 

你可以阅读更多有关回调位置：http://api.rubyonrails.org/classes/ActiveRecord/Callbacks.html