How to determine if any field in a model / nested model changed?

Question

Is there some quick way to find out if any of a model\'s fields or any fields of it\'s nested models (a.k.a. associations) changed?

Answer 1

with 5.1 + the following works for me:

saved_changes? will let you know if your object has changed:

my_object.saved_changes?
=> true

saved_changes will let you know which fields changed, the before value and the after value for each field:

my_object.saved_changes
=> {"first_name"=>['Jim', 'Jimmy'], "updated_at"=>[Thu, 06 Dec 2018 18:45:00 UTC +00:00, Thu, 06 Dec 2018 18:52:44 UTC +00:00]}