This method is deprecated or moved on the latest stable version.
The last existing version (v2.3.8) is shown here.
attribute_change(attr)
private
Handle *_change for method_missing.
# File activerecord/lib/active_record/dirty.rb, line 111
def attribute_change(attr)
[changed_attributes[attr], __send__(attr)] if attribute_changed?(attr)
end
