我有一些具有这种结构的领域数据：

time.Time

我想从部门中选择一些成员并添加到选定的会议中。

public class Member extends RealmObject {

@PrimaryKey
private int id;
private String name;
private String image_url;
}

public class Department extends RealmObject {

@PrimaryKey
private int id;
// some another fields...
private RealmList<Member> members;
}

public class Meeting extends RealmObject {

@PrimaryKey
private int id;
private String title = "";
private RealmList<Member> members = new RealmList<>();
}

下一个Java代码：

//properties
int departmentId = 1;
int meetingId = 4;
Meeting meeting;
Department department;
Realm realm;

//declaration
realm = Realm.getDefaultInstance();
realm.beginTransaction();
meeting = realm.where(Meeting.class).equalTo("id",meetingId).findFirst();

department = realm.where(Department.class).equalTo("id",departmentId).findFirst();

//add members
for (Member member : department.getMembers()) {
    if (!thereIsInList(member,meeting.getMembers()))
        meeting.getMembers().add(member);
}

//realm update and close
realm.insertOrupdate(meeting);
realm.commitTransaction();
realm.close();

但是我看到新成员与会议无关。 请帮我找出问题所在