the db.Save bug

[jiaopengzi]

hello

package main

import (
    "fmt"
    "gorm.io/driver/postgres"
    "gorm.io/gorm"
)

func main() {

    // TestTable
    type TestTable struct {
        gorm.Model
        Field1 uint64 `gorm:"column:field1;type:bigint"`
        Field2 string `gorm:"column:field2;type:varchar(255)"`
    }

    // change to your database information
    dsn := "host=10.10.10.109 user=uroot password=123456 dbname=db_blog port=5432"

    // Connect to the database
    db, _ := gorm.Open(postgres.New(postgres.Config{DSN: dsn}))

    // Execute migration
    _ = db.AutoMigrate(&TestTable{})

    v1 := TestTable{
        Model: gorm.Model{
            ID: 1,
        },
        Field1: 1,
        Field2: "test1",
    }

    // First db.Save
    db.Save(&v1)
    // Retrieve data with Field1: 1
    var result1 TestTable
    db.Where("id = ?", 1).First(&result1)

    fmt.Printf("result1:%v\n", result1)
    // result1:{{1 2024-09-10 09:35:10.785883 +0800 CST 2024-09-10 09:35:10.78346 +0800 CST {0001-01-01 00:00:00 +0000 UTC false}} 1 test1}

    v2 := TestTable{
        Model: gorm.Model{
            ID: 1,
        },
        Field1: 2,
        Field2: "test2",
    }

    // Second db.Save
    db.Save(&v2)

    // Retrieve data with Field1: 1 again
    var result2 TestTable
    db.Where("id = ?", 1).First(&result2)

    fmt.Printf("result2:%v\n", result2)
    //result2:{{1 0001-01-01 08:00:00 +0800 CST 2024-09-10 09:35:10.808792 +0800 CST {0001-01-01 00:00:00 +0000 UTC false}} 2 test2}
}

• go version go1.23.0 windows/amd64
• gorm.io/driver/postgres v1.5.9
• gorm.io/gorm v1.25.11
• postgres:16.3

In the above code, when using db.Save, if there is a created_at field, it is only correct during the first execution of the upsert. Subsequent executions of db.Save will use the zero value to overwrite created_at. I believe this is a bug.

[github-actions[bot]]

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[jiaopengzi]

After reviewing the documentation, this is the expected behavior. It is save all fields not upsert.