type AddressByZipCode struct {
		ZipCode string `gorm:"primary_key"`
		Address string
	}

	DB.Migrator().DropTable(&AddressByZipCode{})
	if err := DB.AutoMigrate(&AddressByZipCode{}); err != nil {
		t.Fatalf("failed to migrate, got error %v", err)
	}

	address := AddressByZipCode{ZipCode: "00501", Address: "Holtsville"}
	DB.Create(&address)

	var result AddressByZipCode