ormlite使用gson和retrofit复制id

Question

我在使用ormlite时遇到问题它给了我重复的ID错误，下面是我的pojo：

public class ParticipantDetailsModel {

@DatabaseField(id = true)
private int id;

@DatabaseField
private String first_name;

@DatabaseField
private String last_name;

}

public class Trainings {

@DatabaseField
private int id;

@DatabaseField
private int participant_id;

@DatabaseField
private int batch_id;

@DatabaseField
private int graduation_program_id;


@DatabaseField(foreign = true, foreignAutoRefresh = true, foreignAutoCreate = true)
private ParticipantDetailsModel participant;

}

目前我需要这个@DatabaseField private int participant_id来将数据填充到本地数据库。我只需要这个用于加入目的：

@DatabaseField(foreign = true, foreignAutoRefresh = true, foreignAutoCreate = true)
private ParticipantDetailsModel participant;


[Ormlite Problem with duplicate field][1]

这是我的加入查询：

 qb1.where().eq("id", item.getId()).and().in("participant_id", parId);
        List<Trainings> u = qb1.join(qb2).query();


SELECT `Trainings`.* FROM `Trainings` INNER JOIN `participantdetailsmodel` ON `Trainings`.`participants_id` = `participantdetailsmodel`.`id` WHERE (`Trainings`.`id` = 34 AND `Trainings`.`participant_id` IN () ) 

ON Trainings。participants_id = participantdetailsmodel。id这个返回null，因为它在本地数据库上为null。