> A lot of high-level ORM frameworks simply save all the objects' fields on update, without doing fine-grained diffs. Perhaps that is true... I'm a Rails dev a

> A lot of high-level ORM frameworks simply save all the objects' fields on update, without doing fine-grained diffs. Perhaps that is true... I'm a Rails dev and ActiveRecord definitely tracks mutations on the object and selectively updates. I would assume this is consistent with Django and I'd assume a policy is probably required to be specified by SQLAlchemy.