In Ruby on Rails,
previous_changes are methods used to track changes in Active Record models.
saved_changes is used after an object is saved to the database. It provides a hash of all the attributes changed when persisting an object, including their original and final values. This method helps understand what changes have just persisted. On the other hand,
previous_changes is used after an object is saved but before reloading. It holds the same information as
saved_changes but becomes available only after the save operation and before the object is reloaded. It is helpful for actions triggered immediately after a save, like callbacks or logging changes.
Both methods are instrumental in tracking attribute changes and responding to them effectively in a Rails application.Tweet