GitHub user dosubot[bot] edited a comment on the discussion: 关于电网拓扑数据导入
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你遇到的“Make sure the primary key fields [id] are not empty, or check whether the
headers or field_mapping are configured correctly”报错，根本原因是 struct_1.json 的
edges 配置 field_mapping 写成了 `"from": "id", "to": "id"`，而不是 `"from": "from",
"to": "to"`，或者 source/target 配置写反了，或者 CSV header/数据有问题。
**请严格检查以下几点：**
1. struct_1.json 的 edges 配置必须是：
```json
"source": ["from"],
"target": ["to"],
"field_mapping": { "from": "from", "to": "to" }
```
不能有 id，不能写反 source/target。
2. power_edges_to.csv（或 edge_connected_to.csv）header 必须严格为：
```
id,from,to,label,source_label,target_label
```
没有多余空格、没有 BOM、没有隐藏字符。
3. 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）。
4. struct_1.json 的 null_values 建议只保留 ["NULL", "null"]，不要加 ""，否则空字符串会被判定为
null，导致 id 为空。
5. 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"。
**常见坑：**
- source/target 写反（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
**如果你已经全部按上述做了，还是报错，请贴出：**
- power_edges_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。
只要这些全部做到，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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GitHub link:
https://github.com/apache/hugegraph/discussions/2917#discussioncomment-15226420
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