type User struct {
		ID        int32 `gorm:"primaryKey"`
		Name      string
		CreatedBy *int32
		Creator   *User `gorm:"foreignKey:CreatedBy;references:ID"`
	}

	checkStructRelation(t, &User{}, Relation{
		Name: "Creator", Type: schema.BelongsTo, Schema: "User", FieldSchema: "User",
		References: []Reference{{"ID", "User", "CreatedBy", "User", "", false}},
	})
}

func TestBelongsToWithMixin(t *testing.T) {

    }

    private void upgradeFrom13_1() {
        // nothing
    }

    private void upgradeFrom13_2() {