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fix: prevent None values in auto-metadata from causing KeyError (#15842)

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## Problem

When users configure auto-metadata for a dataset, parsing crashes with:

```
KeyError: 'properties' in gen_metadata → schema["properties"]
```

## Root Cause

Pydantic `AutoMetadataField` defaults `enum` and `description` to `None`
when the frontend omits these fields:

```python
class AutoMetadataField(Base):
    enum: Annotated[list[str] | None, Field(default=None)]
    description: Annotated[str | None, Field(default=None)]
```

These `None` values propagate through the call chain and cause two
crashes:
This commit is contained in:
Jack
2026-06-09 19:10:48 +08:00
committed by GitHub
parent 2773208159
commit 3eff41361b
4 changed files with 87 additions and 21 deletions
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10
common/metadata_utils.py
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@@ -399,11 +399,11 @@ def _is_metadata_list(obj: list) -> bool:
key = item.get("key")
if not isinstance(key, str) or not key:
return False
if "enum" in item and not isinstance(item["enum"], list):
if "enum" in item and item["enum"] is not None and not isinstance(item["enum"], list):
return False
if "description" in item and not isinstance(item["description"], str):
if "description" in item and item["description"] is not None and not isinstance(item["description"], str):
return False
if "descriptions" in item and not isinstance(item["descriptions"], str):
if "descriptions" in item and item["descriptions"] is not None and not isinstance(item["descriptions"], str):
return False
return True
@@ -414,12 +414,12 @@ def turn2jsonschema(obj: dict | list) -> Dict[str, Any]:
if isinstance(obj, list) and _is_metadata_list(obj):
normalized = []
for item in obj:
description = item.get("description", item.get("descriptions", ""))
description = item.get("description") or item.get("descriptions") or ""
normalized_item = {
"key": item.get("key"),
"description": description,
}
if "enum" in item:
if "enum" in item and item["enum"] is not None:
normalized_item["enum"] = item["enum"]
normalized.append(normalized_item)
return metadata_schema(normalized)