GitHub user dosubot[bot] edited a comment on the discussion: 关于电网拓扑数据导入
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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. **edge_connected_to.csv 的 id 字段不要导入为边属性**
HugeGraph 边的属性必须在 schema.groovy 的 edgeLabel 里用 .properties() 明确声明，否则 loader 会报
“Invalid property 'id' for edge label” 错误。如果你不需要把 id
作为边的属性存储（绝大多数场景都不需要），struct.json 的 field_mapping 只写 from/to，不要写 id。比如：
```json
"field_mapping": { "from": "id", "to": "id" }
```
edgeLabel 的 .properties() 只写 "source_label", "target_label"（如果你需要存储
source_label/target_label），不要加 "id"。
2. **value_mapping 必须是平铺结构，不能嵌套**
正确写法是：
```json
"value_mapping": {
"label": { "CONNECTED_TO": "LineSegment2LineSegment" },
"source_label": { "LineSegment": "LineSegment" },
"target_label": { "LineSegment": "LineSegment" }
}
```
不要写成嵌套在 label 下面的结构。
---
**标准写法举例：**
schema.groovy（以 LineSegment2LineSegment 为例）：
```groovy
schema.edgeLabel("LineSegment2LineSegment")
.sourceLabel("LineSegment")
.targetLabel("LineSegment")
.properties("source_label", "target_label")
.ifNotExist().create();
```
struct.json（以 LineSegment2LineSegment 为例）：
```json
{
"label": "LineSegment2LineSegment",
"source": ["from"],
"target": ["to"],
"input": {
"type": "file",
"path": "/loader/power_data/edge_connected_to.csv",
"format": "CSV",
"header": ["id", "from", "to", "label", "source_label", "target_label"]
},
"field_mapping": { "from": "id", "to": "id" },
"value_mapping": {
"label": { "CONNECTED_TO": "LineSegment2LineSegment" },
"source_label": { "LineSegment": "LineSegment" },
"target_label": { "LineSegment": "LineSegment" }
}
}
```
---
**检查清单：**
- edgeLabel 的 .properties() 只包含实际需要的属性（如 "source_label", "target_label"），不要加
"id"。
- struct.json 的 field_mapping 只写 from/to，不要写 id。
- value_mapping 必须是平铺结构。
- edge_connected_to.csv 的 source_label/target_label 必须和顶点 label 完全一致（区分大小写）。
这样配置后，边就能正常导入且无报错。如果还有具体报错，可以贴出 struct.json/schema.groovy/CSV 的片段，我可以帮你逐条检查。
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)。
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GitHub link:
https://github.com/apache/hugegraph/discussions/2917#discussioncomment-15205241
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