GitHub user dosubot[bot] edited a comment on the discussion: 关于电网拓扑数据导入
<!-- Answer -->
你的配置只差一步就能导入成功：**每个边标签（edgeLabel）的 .properties() 必须包含所有实际要导入的属性**，否则 loader 会报
“Invalid property 'source_label' for edge label” 这样的错【参考1】【参考2】。
你现在 schema.groovy 里边标签是这样写的：
```groovy
schema.edgeLabel("Substation2LineSegment").sourceLabel("Substation").targetLabel("LineSegment").properties().ifNotExist().create();
```
应该改成：
```groovy
schema.edgeLabel("Substation2LineSegment")
.sourceLabel("Substation")
.targetLabel("LineSegment")
.properties("source_label", "target_label")
.ifNotExist().create();
```
所有用到 source_label、target_label 的边标签都要这样写（不要加 id，除非你真的要把 id 作为边属性存储）。你的
struct.json 和 value_mapping 写法是对的，field_mapping 只写 from/to 就行。
**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" }
}
}
```
**注意事项：**
- edgeLabel 的 .properties() 只写 "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，所有关系都能导入【参考3】【参考4】。
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。
---
**参考：**
-
[官方文档：边属性声明与导入机制](https://github.com/apache/incubator-hugegraph-doc/blob/master/content/en/docs/quickstart/toolchain/hugegraph-loader.md#L705-L1064)
-
[源码机制说明](https://github.com/apache/incubator-hugegraph/blob/master/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/schema/builder/EdgeLabelBuilder.java)
- [官方 schema
示例](https://github.com/apache/incubator-hugegraph-doc/blob/master/content/en/docs/language/hugegraph-example.md)
- [社区案例](https://github.com/apache/incubator-hugegraph/issues/2749)
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GitHub link:
https://github.com/apache/hugegraph/discussions/2917#discussioncomment-15205750
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