Neo4j 3.0.1SDN4.1.1.RELEASE幻影节点
在我的Neo4j 3.0.1和SDN 4.1.1.RELEASE项目中，我有以下实体：
@NodeEntity
public class CriterionGroup extends Authorable {
private final static String DEFINED_BY = "DEFINED_BY";
private final static String CONTAINS = "CONTAINS";
private String name;
private String description;
@Relationship(type = DEFINED_BY, direction = Relationship.OUTGOING)
private Decision owner;
@Relationship(type = CONTAINS, direction = Relationship.OUTGOING)
private Set<Criterion> criteria = new HashSet<>();
....
@NodeEntity
public class Criterion extends Authorable {
private final static String CONTAINS = "CONTAINS";
private final static String DEFINED_BY = "DEFINED_BY";
private String name;
private String description;
@Relationship(type = CONTAINS, direction = Relationship.INCOMING)
private CriterionGroup group;
@Relationship(type = DEFINED_BY, direction = Relationship.OUTGOING)
private Decision owner;
....
@NodeEntity
public class Decision extends Commentable {
private final static String CONTAINS = "CONTAINS";
private final static String DEFINED_BY = "DEFINED_BY";
private final static String VOTED_FOR = "VOTED_FOR";
private String name;
@Relationship(type = CONTAINS, direction = Relationship.INCOMING)
private Set<Decision> parentDecisions = new HashSet<>();
@Relationship(type = CONTAINS, direction = Relationship.OUTGOING)
private Set<Decision> childDecisions = new HashSet<>();
@Relationship(type = DEFINED_BY, direction = Relationship.INCOMING)
private Set<CriterionGroup> criterionGroups = new HashSet<>();
@Relationship(type = DEFINED_BY, direction = Relationship.INCOMING)
private Set<Criterion> criteria = new HashSet<>();
....在我的测试中，我尝试使用以下存储库方法删除CriterionGroup：
@Query("MATCH ()-[r]-(cg:CriterionGroup) WHERE id(cg) = {criterionGroupId} DELETE cg, r")
void deleteCriterionGroup(@Param("criterionGroupId") Long criterionGroupId);然后我试着用id得到这个CriterionGroup
criterionGroupRepository.findOne(id);它返回NULL。到目前一切尚好。
在此之后，我试图从Criterion中获取组对象，该对象位于已删除的CriterionGroup中，并返回..删除CriterionGroup
criterionRepository.findOne(criterion.getId()).getGroup()我做错什么了？在SDN 3.4.4.RELEASE和Neo4j 2.3.3上，一切都很好，但是由于知识有限，Neo4j 3.0.1 SDN 4.1.1.RELEASE有很多意想不到的情况。
另外，是否可以在一个实体中定义以下关系(我已经删除了enforceTargetType )
@Relationship(type = CONTAINS, direction = Relationship.INCOMING)
private Set<Decision> parentDecisions = new HashSet<>();
@Relationship(type = CONTAINS, direction = Relationship.OUTGOING)
private Set<Decision> childDecisions = new HashSet<>();他们有不同的方向。
回答 1
Stack Overflow用户
发布于 2016-05-25 12:16:19
据我所知，您正在重新显示这个CriterionGroup，因为您通过自定义查询删除了它，从而绕过了OGM。图表知道您的更改，但OGM的映射上下文不知道。解决方案是在您使用Session.detachEntity(id)通过自定义查询删除该实体之后，将它从会话中注销，或者使用session.clear()刷新整个会话。
是的，有包含关系定义是可以的，请记住，对于标记为INCOMING的任何关系，如果parentDecisions存在于@Relationship(type = CONTAINS, direction = Relationship.INCOMING)中，则必须对访问器、变量和属性进行注释。
更新：还确保您的对象模型与您通过自定义查询删除的内容同步。也就是说，如果要通过自定义查询删除CriterionGroup，还应该更新对象模型以反映这一点，即criterion.group=null。或者，使用session.clear()完全清除会话并重新加载所有依赖实体。
https://stackoverflow.com/questions/37423585
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