配置双向一对多pet set master后执行updateWith(pet,"master") 无法自动修改pet.masterId

@Table("tt_master")
public class Master {
	
	@Id
    private int id;

    @Name
    private String name;
    
    @Many(target = Pet.class, field = "masterId")
    private List<Pet> pets;
...
}

@Table("tt_pet")
public class Pet {
	
	@Id
    private int id;

    @Name
    private String name;
    
    @Column
    private int masterId;
    
    @One(target=Master.class,field="masterId")
    private Master master;
...
}

moudle

@At
	public void testUpdateWithPet(){
		Master master=new Master();
		//master.setName("lee2");
		//dao2.insert(master);
		master=dao2.fetch(Master.class,3);
		Pet pet=dao2.fetch(Pet.class,3);
		pet.setName("doudou5");
		pet.setMaster(master);
		dao2.updateWith(pet,"master");
		pet=dao2.fetch(Pet.class,4);
		pet.setName("doudou6");
		pet.setMaster(master);
		dao2.updateWith(pet,"master");
	}

什么意思？