Friends   []*User           `gorm:"many2many:user_friends"`
	Active    *bool
}

type (
	mytime time.Time
	myint  int
	mybool = bool
)

type AdvancedDataTypeUser struct {
	ID           sql.NullInt64
	Name         *sql.NullString
	Birthday     sql.NullTime
	RegisteredAt mytime
	DeletedAt    *mytime
	Active       mybool
	Admin        *mybool
}

type BaseModel struct {
	ID        uint

	Languages []Language `gorm:"many2many:UserSpeak;"`
	Friends   []*User    `gorm:"many2many:user_friends;"`
	Active    bool
}

type Account struct {
	gorm.Model
	UserID sql.NullInt64
	Number string
}

type Pet struct {
	gorm.Model
	UserID *uint
	Name   string
	Toy    Toy `gorm:"polymorphic:Owner;"`
}

type Toy struct {
	gorm.Model
	Name      string
	OwnerID   string

		}

		var pet4 Pet
		DB.Preload("Toy").Find(&pet4, "id = ?", pet.ID)
		CheckPet(t, pet4, pet)
	})

	t.Run("Restriction", func(t *testing.T) {
		type CustomizeAccount struct {
			gorm.Model
			UserID  sql.NullInt64
			Number  string `gorm:"<-:create"`
			Number2 string
		}

		type CustomizeUser struct {
			gorm.Model
			Name    string
			Account CustomizeAccount `gorm:"foreignkey:UserID"`
		}

    List<@Nullable Integer> list5 = Lists.newArrayList(1, null, 2);
    List<@Nullable Integer> list6 = Lists.newArrayList(2);
    List<@Nullable Integer> list7 = Lists.newArrayList(nullInt);
    List<@Nullable Integer> list8 = Lists.newArrayList(nullInt, nullInt);
    List<@Nullable List<@Nullable Integer>> list =
        Lists.newArrayList(list1, list2, list3, list4, list5, list6, list7, list8, null);