module Dirty

Active Record Attribute Methods Dirty

Provides a way to track changes in your Active Record models. It adds all methods from ActiveModel::Dirty and adds database-specific methods.

A newly created Person object is unchanged:

“‘ class Person < ActiveRecord::Base end

person = Person.create(name: “Allison”) person.changed? # => false “‘

Change the name:

“‘ person.name = ’Alice’ person.name_in_database # => “Allison” person.will_save_change_to_name? # => true person.name_change_to_be_saved # => [“Allison”, “Alice”] person.changes_to_save # => {“name”=>[“Allison”, “Alice”]} “‘

Save the changes:

“‘ person.save person.name_in_database # => “Alice” person.saved_change_to_name? # => true person.saved_change_to_name # => [“Allison”, “Alice”] person.name_before_last_save # => “Allison” “`

Similar to ActiveModel::Dirty, methods can be invoked as saved_change_to_name? or by passing an argument to the generic method ‘saved_change_to_attribute?(“name”)`.