If the created_at field is not added, the db.Save() function will continue to perform insertion operations. #6134
Description
GORM Playground Link
This is a fake URL to prevent this bug from being overlooked: go-gorm/playground#1
Description
The data model:
type User struct {
ID uint
Name string
}Here are the steps to reproduce：
// Create first record
db.Create(&User{})
// Fetch the first record
var user *User
db.First(&user)
// Save record
user.Name = "jinzhu 2"
db.Save(&user)
// Save again with the same data
// It will throw an error: Error 1062 (23000): Duplicate entry '1' for key 'users.PRIMARY'
user.Name = "jinzhu 2"
db.Save(&user)