Gorm db.Save updates CreatedAt with a zero value.

GORM Playground Link

https://github.com/go-gorm/playground/pull/742

Description

db.Save updates CreatedAt with a zero value. Then throws an error. Gorm should automatically handle CreatedAt and ignore zero values, right?

db.Create sets UpdatedAt to the current time, shouldn't it be null?

Comment From: jinzhu

Create will fill the created_at field if it is empty, but Save will not do so with a blank primary key.