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

You can setup multiple methods to be called by the before_validation callback. So instead of straight up defining the before_validation, you can pass the methods you want to get called before validation.

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

You can read more about callbacks here: http://api.rubyonrails.org/classes/ActiveRecord/Callbacks.html