Active Record, changes from.. to..

[angelo capilleri]

Hi,

I'm thinking about a method that responds true or false for the changes of attributes from a value to another to trace a little bit the status of an AR object.

Ex.

class Book < ActiveRecord::Base

  STATUS_DELIVER = [0,1]

  before_save :send_mail_to_customer

  def send_mail_to_customer

    UserMailer.send_mail_to_customer if self.changes['status'] == [0, 1]

  end

end

It' a simple case but when complexity grows up a method like

 def send_mail_to_customer

   UserMailer.send_mail_to_customer if self.status.changes(from: 0, to: 1)

 end

 Maybe is more mantenible and readable.

[Peter Brown]

I believe you can do this already with ActiveModel::Dirty:

def send_mail_to_customer

  UserMailer.send_mail_to_customer if status_change == [0, 1]

end

[Yasuharu Ozaki]

This feature "from" and "to" was interesting, I extracted this to a gem

https://github.com/YasuOza/activemodel-attribute_changed_specification/

I wish this gem makes your happy.

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Yasuharu Ozaki
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[angelo capilleri]

Very nice! We coult try to made a Pr to Rails...