1
我可以添加和保存多個SchoolRef，但是在獲取（祖先和熱切地獲取）教育對象，然後嘗試添加另一個SchoolRef。這與SDN 2.0.1一起工作，但我也改變了其他的東西，包括下面的Repository/Cypher查詢，所以我無法將它隔離到升級。SDN 2.1.0/neo4j 1.8：java.lang.IllegalArgumentException：無法獲取字段'schoolRef'的單個字段值
@Fetch @RelatedTo(type = "EDUCATION_HAS_SCHOOLREF")
private Set<SchoolRef> schoolRefs = new HashSet<SchoolRef>();
public Education() {
}
public void addSchoolRef(SchoolRef schoolRef) {
getSchoolRefs().add(schoolRef);
}
庫：
public interface UserRepository extends GraphRepository<User>, CypherDslRepository<User> {
@Query("start id=node:Identifier(identifier={0}) match id<-[:USER_HAS_IDENTIFIER]-user return user")
public User findById(String id);
堆棧跟蹤：
Caused by: java.lang.IllegalArgumentException: Cannot obtain single field value for field 'schoolRef'
at org.springframework.data.neo4j.fieldaccess.RelatedToSingleFieldAccessorFactory$RelatedToSingleFieldAccessor.getValue(RelatedToSingleFieldAccessorFactory.java:94)
at org.springframework.data.neo4j.fieldaccess.DefaultEntityState.getValue(DefaultEntityState.java:97)
at org.springframework.data.neo4j.support.mapping.SourceStateTransmitter.copyEntityStatePropertyValue(SourceStateTransmitter.java:90)
at org.springframework.data.neo4j.support.mapping.SourceStateTransmitter.access$000(SourceStateTransmitter.java:40)
at org.springframework.data.neo4j.support.mapping.SourceStateTransmitter$2.doWithAssociation(SourceStateTransmitter.java:61)
at org.springframework.data.mapping.model.BasicPersistentEntity.doWithAssociations(BasicPersistentEntity.java:207)
at org.springframework.data.neo4j.support.mapping.SourceStateTransmitter.copyPropertiesFrom(SourceStateTransmitter.java:57)
at org.springframework.data.neo4j.support.mapping.Neo4jEntityConverterImpl.loadEntity(Neo4jEntityConverterImpl.java:100)
at org.springframework.data.neo4j.support.mapping.Neo4jEntityConverterImpl.read(Neo4jEntityConverterImpl.java:92)
at org.springframework.data.neo4j.support.mapping.Neo4jEntityPersister$CachedConverter.read(Neo4jEntityPersister.java:170)
at org.springframework.data.neo4j.support.mapping.Neo4jEntityPersister.createEntityFromState(Neo4jEntityPersister.java:189)
at org.springframework.data.neo4j.support.Neo4jTemplate.createEntityFromState(Neo4jTemplate.java:180)
at org.springframework.data.neo4j.fieldaccess.RelationshipHelper.createEntitySetFromRelationshipEndNodes(RelationshipHelper.java:130)
at org.springframework.data.neo4j.fieldaccess.RelatedToFieldAccessor.createEntitySetFromRelationshipEndNodes(RelatedToFieldAccessor.java:86)
at org.springframework.data.neo4j.fieldaccess.RelatedToSingleFieldAccessorFactory$RelatedToSingleFieldAccessor.getValue(RelatedToSingleFieldAccessorFactory.java:76)
at org.springframework.data.neo4j.fieldaccess.DefaultEntityState.getValue(DefaultEntityState.java:97)
at org.springframework.data.neo4j.support.mapping.SourceStateTransmitter.copyEntityStatePropertyValue(SourceStateTransmitter.java:90)
at org.springframework.data.neo4j.support.mapping.SourceStateTransmitter.access$000(SourceStateTransmitter.java:40)
at org.springframework.data.neo4j.support.mapping.SourceStateTransmitter$2.doWithAssociation(SourceStateTransmitter.java:61)
at org.springframework.data.mapping.model.BasicPersistentEntity.doWithAssociations(BasicPersistentEntity.java:207)
at org.springframework.data.neo4j.support.mapping.SourceStateTransmitter.copyPropertiesFrom(SourceStateTransmitter.java:57)
at org.springframework.data.neo4j.support.mapping.Neo4jEntityConverterImpl.loadEntity(Neo4jEntityConverterImpl.java:100)
at org.springframework.data.neo4j.support.mapping.Neo4jEntityConverterImpl.read(Neo4jEntityConverterImpl.java:92)
at org.springframework.data.neo4j.support.mapping.Neo4jEntityPersister$CachedConverter.read(Neo4jEntityPersister.java:170)
at org.springframework.data.neo4j.support.mapping.Neo4jEntityPersister.createEntityFromState(Neo4jEntityPersister.java:189)
at org.springframework.data.neo4j.support.mapping.Neo4jEntityPersister.persist(Neo4jEntityPersister.java:244)
at org.springframework.data.neo4j.support.mapping.Neo4jEntityPersister.persist(Neo4jEntityPersister.java:231)
at org.springframework.data.neo4j.support.Neo4jTemplate.save(Neo4jTemplate.java:293)
at org.springframework.data.neo4j.support.Neo4jTemplate.save(Neo4jTemplate.java:287)
at org.springframework.data.neo4j.fieldaccess.RelationshipHelper.getOrCreateState(RelationshipHelper.java:119)
at org.springframework.data.neo4j.fieldaccess.RelationshipHelper.createSetOfTargetNodes(RelationshipHelper.java:111)
at org.springframework.data.neo4j.fieldaccess.RelatedToFieldAccessor.createSetOfTargetNodes(RelatedToFieldAccessor.java:82)
at org.springframework.data.neo4j.fieldaccess.RelatedToCollectionFieldAccessorFactory$RelatedToCollectionFieldAccessor.setValue(RelatedToCollectionFieldAccessorFactory.java:66)
at org.springframework.data.neo4j.fieldaccess.ManagedFieldAccessorSet.updateValue(ManagedFieldAccessorSet.java:94)
at org.springframework.data.neo4j.fieldaccess.ManagedFieldAccessorSet.update(ManagedFieldAccessorSet.java:82)
at org.springframework.data.neo4j.fieldaccess.ManagedFieldAccessorSet.add(ManagedFieldAccessorSet.java:108)
----編輯： 同樣的錯誤，而是根據不同的情況..
School school = new School();
school = neo4j.repositoryFor(School.class).save(school);
User user1 = new User("Junit", "1");
SchoolRef schoolRef1 = new SchoolRef();
schoolRef1.setSchool(school);
user1.addSchoolRef(schoolRef1);
user1 = neo4j.repositoryFor(User.class).save(user1);
User user2 = new User("Junit", "2");
SchoolRef schoolRef2 = new SchoolRef();
schoolRef2.setSchool(school);
user2.addSchoolRef(schoolRef2);
user2 = neo4j.repositoryFor(User.class).save(user2); // <- error here
你如何獲得教育實體？通過Neo4jTemplate，一個存儲庫，一個密碼查詢，...？ – tstorms
你的班上似乎有一個叫'schoolRef'的成員，而你在'schoolRefs'找錯了？ –
@tstorms我更新了存儲庫和密碼查詢的問題。 –