Dirty
A newly instantiated object is unchanged: person = Person.find_by_name(‘uncle bob’) person.changed? # => false
Change the name: person.name = ‘Bob’ person.changed? # => true person.name_changed? # => true person.name_was # => ‘uncle bob’ person.name_change # => [‘uncle bob’, ‘Bob’] person.name = ‘Bill’ person.name_change # => [‘uncle bob’, ‘Bill’]
Save the changes: person.save person.changed? # => false person.name_changed? # => false
Assigning the same value leaves the attribute unchanged: person.name = ‘Bill’ person.name_changed? # => false person.name_change # => nil
Which attributes have changed? person.name = ‘bob’ person.changed # => [‘name’] person.changes # => { ‘name’ => [‘Bill’, ‘bob’] }
NOTE: This description has been extracted from the Plugin README and so the formatting may need updating to make browser friendly
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