method 
 changed_attributes
  Ruby on Rails latest stable (v7.1.3.2) - 0 notes - Class: ActiveModel::Dirty   
 - 1.0.0
 - 1.1.6
 - 1.2.6
 - 2.0.3
 - 2.1.0
 - 2.2.1
 - 2.3.8
 - 3.0.0 (0)
 - 3.0.9 (-1)
 - 3.1.0 (0)
 - 3.2.1 (0)
 - 3.2.8 (0)
 - 3.2.13 (0)
 - 4.0.2 (38)
 - 4.1.8 (0)
 - 4.2.1 (0)
 - 4.2.7 (0)
 - 4.2.9 (0)
 - 5.0.0.1 (0)
 - 5.1.7 (0)
 - 5.2.3 (0)
 - 6.0.0 (0)
 - 6.1.3.1 (0)
 - 6.1.7.7 (0)
 - 7.0.0 (0)
 - 7.1.3.2 (0)
 - 7.1.3.4 (0)
 - What's this?
 
changed_attributes() public Returns a hash of the attributes with unsaved changes indicating their original values like attr => original value.
person.name # => "bob" person.name = 'robert' person.changed_attributes # => {"name" => "bob"}

 
 