GitHub user dosubot[bot] added a comment to the discussion: 关于电网拓扑数据导入
<!-- Answer -->
你的 value_mapping 写法是对的，但你的配置还有两个关键点需要修正，否则边会全部插入失败：
1. **field_mapping 只写 from/to，不要写 id**
struct.json 的 edges 里 field_mapping 应该这样写：
```json
"field_mapping": { "from": "id", "to": "id" }
```
不要把 id 字段导入为边属性，除非 edgeLabel 的 .properties() 里有 id（绝大多数场景不需要）。
2. **schema.groovy 的 edgeLabel .properties() 只写 source_label、target_label，不要加
id**
比如：
```groovy
schema.edgeLabel("LineSegment2LineSegment")
.sourceLabel("LineSegment")
.targetLabel("LineSegment")
.properties("source_label", "target_label")
.ifNotExist().create();
```
不要写 .properties("id", "source_label", "target_label")，否则 loader 会报 “Invalid
property 'id' for edge label”。
3. **value_mapping 必须是平铺结构**
你的写法没问题，保持这样：
```json
"value_mapping": {
"label": { "CONNECTED_TO": "LineSegment2LineSegment" },
"source_label": { "LineSegment": "LineSegment" },
"target_label": { "LineSegment": "LineSegment" }
}
```
4. **edge_connected_to.csv 的 source_label/target_label 必须和顶点 label
完全一致（区分大小写）**
比如 from=XLD-3445 在 vertex_linesegment-1.csv 里，label 是 LineSegment，就写
LineSegment。
**最终检查清单：**
- edgeLabel 的 .properties() 只包含 "source_label", "target_label"，不要加 "id"
- struct.json 的 field_mapping 只写 from/to，不要写 id
- value_mapping 是平铺结构
- edge_connected_to.csv 的 source_label/target_label 和顶点 label 完全一致
这样配置后，边就能正常导入且无报错，所有关系都能导入。详细机制见[官方文档](https://github.com/apache/incubator-hugegraph-doc/blob/3e1c610281c91ea3a5c600b393088e9ffae34799/content/en/docs/quickstart/toolchain/hugegraph-loader.md#L705-L1064)。
如还有具体报错，可以贴出 struct.json/schema.groovy/CSV 的片段，我可以帮你逐条检查。
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