Question

Neo4J OGM v2.0.4的代码读取（文件org / neo4j / ogm / context / GraphEntityMapper.java，第313-339行）：

    // If the source has a writer for an outgoing relationship for the rel entity, then write the rel entity on the source if it's a scalar writer
    ClassInfo sourceInfo = metadata.classInfo(source);
    RelationalWriter writer = entityAccessStrategy.getRelationalWriter(sourceInfo, edge.getType(), Relationship.OUTGOING, relationshipEntity);
    if (writer == null) {
        logger.debug("No writer for {}", target);
    } else {
        if (writer.forScalar()) {
            writer.write(source, relationshipEntity);
            mappingContext.registerRelationship(new MappedRelationship(edge.getStartNode(), edge.getType(), edge.getEndNode(), edge.getId(), source.getClass(), ClassUtils.getType(writer.typeParameterDescriptor())));
        } else {
            oneToMany.add(edge);
        }
    }

    //If the target has a writer for an incoming relationship for the rel entity, then write the rel entity on the target if it's a scalar writer
    ClassInfo targetInfo = metadata.classInfo(target);
    writer = entityAccessStrategy.getRelationalWriter(targetInfo, edge.getType(), Relationship.INCOMING, relationshipEntity);

    if (writer == null) {
        logger.debug("No writer for {}", target);
    } else {
        if (writer.forScalar()) {
            writer.write(target, relationshipEntity);
        } else {
            oneToMany.add(edge);
        }
    }

但是不应该读第一条日志消息

logger.debug("No writer for {}", target);

代替？我收到一条令人困惑的日志消息，上面写着我的一类没有作家，但那个班级肯定有作家。我问，因为我想确保我没有忽视任何事情。

干杯谢谢，

斯蒂芬

Answer 1

当您的关系实体是集合时，您可能会看到此调试消息。映射器首先尝试为单个关系查找关系编写器，然后返回到集合。所以除非你发现你的关系实体没有被持久化，否则你可能没什么可担心的。

Neo4J Java无法加载关系：“没有编写者......”：Neo4J OGM日志记录错误？

1 个答案: