实体类中有集合，存不进去

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代码如下，我发现集合类型的字段存不进去，这块应该怎么处理呢？
`@Table("OutlineTreeTest2")
public class OutlineTreeVo implements Serializable {

@PrimaryKey(AssignType.BY_MYSELF)
private int outlineId;

private String outlineName;
private int sequence;
private int hierarchyId;
private int parentId;
private int initialId;//大纲初始ID
private String status;
private int examCount;
@Mapping(Relation.OneToMany)
private List examIds;
private int examFilterCount;
@Ignore
private List examFilterIds;
private int doneExamCount;
@Ignore
private List doneExamIds;
private int correctExamCount;
@Ignore
private List correctExamIds;
private String rightRate;
//统计信息
@Mapping(Relation.OneToOne)
private OutlineStatisticVo outlineStatisticVo;
@Mapping(Relation.OneToMany)
private List children;`

Start with the OutlineTreeVo example and inspect how @Mapping(Relation.OneToMany) handles the examIds and children collection fields, along with the @Ignore fields. Reproduce the reported save-and-load behavior and document or fix collection persistence so the supported fields can be stored and retrieved as intended.

Written by the indexing model from the issue text.