CODEWITHSUNDEEP
ruby-on-railsruby-on-rails-5
Alvaro Cuenca
Alvaro Cuenca

Reputation: 41

How to determine changed attributes on after_save callback

I can't catch the changed attributes on after_save callback but I can catch them on after_update callback. I think after_save is just a combination of after_create and after_update. I'd appreciate it if someone give me at least a hint.

class Student < ApplicationRecord

  after_save: after_save_callback


  def after_save_callback
    if username_changed?  ### This is always false
      # do something
    end
  end

end

student = Student.create(name: 'John Doe', username: 'abcdef')

student.username = '123456'
student.save

My Rails version is 5.0.7.

Upvotes: 4

Views: 1713

Answers (1)

Atish Maske
Atish Maske

Reputation: 31

You can use saved_change_to_username?

The behavior of attribute_changed? inside of after callbacks will be changing in the next version of Rails. The new return value will reflect the behavior of calling the method after save returned (e.g. the opposite of what it returns now). To maintain the current behavior, use saved_change_to_attribute? instead.

Upvotes: 3

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