https://blog.davidvassallo.me/2021/04/25/golang-one-function-one-argument-multiple-types/

interfaces_demo.go

package main

import (
	"gorm.io/driver/sqlite"
	"gorm.io/gorm"
)

type job1 struct {
	ID           int `gorm:"primaryKey"`
	UniqueField1 string
	CommonField1 string
}

type job2 struct {
	ID           int `gorm:"primaryKey"`
	UniqueField2 string
	CommonField2 string
}

type job interface {
	GetCommonFieldVal() string
	GetCommonFieldName() string
	GetDBModel() interface{}
}

func (j job1) GetCommonFieldVal() string {
	return j.CommonField1
}

func (j job2) GetCommonFieldVal() string {
	return j.CommonField2
}

func (j job1) GetCommonFieldName() string {
	return "common_field1"
}

func (j job2) GetCommonFieldName() string {
	return "common_field2"
}

func (j job1) GetDBModel() interface{} {
	return &j
}

func (j job2) GetDBModel() interface{} {
	return &j
}

var db, _ = gorm.Open(sqlite.Open("test.db"), &gorm.Config{})

func worker(j job) {
	db.Model(j.GetDBModel()).Update(j.GetCommonFieldName(), "new-val")
}

func main() {

	db.AutoMigrate(&job1{})
	db.AutoMigrate(&job2{})

	sampleJob1 := job1{
		UniqueField1: "foo",
		CommonField1: "old-common1",
	}

	sampleJob2 := job2{
		UniqueField2: "baz",
		CommonField2: "old-common2",
	}

	db.Model(&sampleJob1).FirstOrCreate(&sampleJob1)
	db.Model(&sampleJob2).FirstOrCreate(&sampleJob2)

	worker(sampleJob2)

}