Re: [D] 关于电网拓扑数据导入 [incubator-hugegraph]

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GitHub user dosubot[bot] added a comment to the discussion: 关于电网拓扑数据导入

<!-- Answer -->
你的 struct_1.json 里 edges 的 field_mapping 必须写成：

```json
"field_mapping": { "from": "from", "to": "to" }
```

不能写成 { "from": "id", "to": "id" }，否则 loader 会把 CSV 的 id 列当作边属性导入，但 
schema.groovy 的 edgeLabel 没有声明 id 属性，导致 “Invalid property 'id' for edge label” 
或 “主键字段 [id] 为空” 的报错。

如果你已经这样写了但还是报错，**请务必检查以下几点**：

1. **source/target 配置必须是** `"source": ["from"], "target": ["to"]`，不能写反。
2. **field_mapping 必须是** `{ "from": "from", "to": "to" }`，不要有 id。
3. **CSV header 必须严格为** `id,from,to,label,source_label,target_label`，不能有多余空格或 
BOM。
4. **所有 from/to 字段都不能有空值，且和顶点 id 完全一致**（无多余空格、无大小写问题、无空行）。
5. **null_values 建议只保留 ["NULL", "null"]，不要加 ""**，否则空字符串会被判定为 null。
6. **schema.groovy 的边标签 .properties() 只包含实际需要的属性**（如 "source_label", 
"target_label"），不要加 "id"。

如果你已经全部按上述做了，还是报 “Make sure the primary key fields [id] are not empty, or check 
whether the headers or field_mapping are configured correctly”，请贴出：

- edge_connected_to.csv 的 header 和前 2 行原始数据（不要做任何处理）
- struct_1.json 某个 edges 配置的完整内容（尤其是 source/target/field_mapping/value_mapping）

这样我可以帮你定位具体是哪一行或哪一列有问题。

**常见坑：**
- source/target 写反了（比如 "source": ["to"], "target": ["from"]）
- field_mapping 写成了 id
- CSV header 有隐藏字符或 BOM
- null_values 配置了空字符串
- 顶点 id 有重复或空行

只要这几点全部做到，边就能正常导入且无报错，所有关系都能导入。[官方FAQ说明](https://github.com/apache/incubator-hugegraph-doc/blob/master/content/en/docs/guides/faq.md)


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