Saves the associated record if it’s new or :autosave is enabled on the association.
In addition, it will destroy the association if it was marked for destruction with mark_for_destruction.
# File activerecord/lib/active_record/autosave_association.rb, line 372 def save_belongs_to_association(reflection) if (association = association_instance_get(reflection.name)) && !association.destroyed? autosave = reflection.options[:autosave] if autosave && association.marked_for_destruction? association.destroy elsif autosave != false saved = association.save(!autosave) if association.new_record? || autosave if association.updated? association_id = association.send(reflection.options[:primary_key] || :id) self[reflection.primary_key_name] = association_id # TODO: Removing this code doesn't seem to matterâ¦ if reflection.options[:polymorphic] self[reflection.options[:foreign_type]] = association.class.base_class.name.to_s end end saved if autosave end end end