Validation errors from multiple fields are not in ClassValidationError
维护者通常 1 天内回复
还没有人认领这个 Issue。
评估
调研方向
Start by running the provided Python reproducer against cattrs.structure and then inspect cattrs.transform_exception with the resulting ClassValidationError. Trace how validation failures from fields a and b are collected and transformed; done means both field errors appear in ClassValidationError and the transformed output identifies their locations.
由索引模型根据 Issue 内容生成。
描述
python version: 3.13.7
attrs version: 25.4.0
cattrs version 25.3.0
When I try to structure a dict into a class, I only see a validation error from one field, when I would expect to see multiple.
Example:
import attrs
import cattrs
@attrs.define()
class Foo:
a: str = attrs.field(validator=[attrs.validators.min_len(3)])
b: str = attrs.field(validator=[attrs.validators.min_len(3)])
cattrs.structure(
{"a": "a", "b": "b"},
Foo,
)
I am expecting to see validation errors from fields a and b, but only see a:
Traceback (most recent call last):
File "<cattrs generated structure __main__.Foo>", line 16, in structure_Foo
return __cl(
**res,
)
File "<attrs generated methods __main__.Foo>", line 28, in __init__
__attr_validator_a(self, __attr_a, self.a)
~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
File ".venv/lib/python3.13/site-packages/attr/_make.py", line 3279, in __call__
v(inst, attr, value)
~^^^^^^^^^^^^^^^^^^^
File ".venv/lib/python3.13/site-packages/attr/validators.py", line 575, in __call__
raise ValueError(msg)
ValueError: Length of 'a' must be >= 3: 1
During handling of the above exception, another exception occurred:
+ Exception Group Traceback (most recent call last):
| File "/home/lincoln/.config/JetBrains/PyCharm2025.2/scratches/scratch_2.py", line 12, in <module>
| cattrs.structure(
| ~~~~~~~~~~~~~~~~^
| {"a": "a", "b": "b"},
| ^^^^^^^^^^^^^^^^^^^^^
| Foo,
| ^^^^
| )
| ^
| File ".venv/lib/python3.13/site-packages/cattrs/converters.py", line 589, in structure
| return self._structure_func.dispatch(cl)(obj, cl)
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
| File "<cattrs generated structure __main__.Foo>", line 19, in structure_Foo
| except Exception as exc: raise __c_cve('While structuring ' + 'Foo', [exc], __cl)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| cattrs.errors.ClassValidationError: While structuring Foo (1 sub-exception)
+-+---------------- 1 ----------------
| Traceback (most recent call last):
| File "<cattrs generated structure __main__.Foo>", line 16, in structure_Foo
| return __cl(
| **res,
| )
| File "<attrs generated methods __main__.Foo>", line 28, in __init__
| __attr_validator_a(self, __attr_a, self.a)
| ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
| File ".venv/lib/python3.13/site-packages/attr/_make.py", line 3279, in __call__
| v(inst, attr, value)
| ~^^^^^^^^^^^^^^^^^^^
| File ".venv/lib/python3.13/site-packages/attr/validators.py", line 575, in __call__
| raise ValueError(msg)
| ValueError: Length of 'a' must be >= 3: 1
+------------------------------------
Plus when I pass that exception to cattrs.transform_exception the output list is
['invalid value @ $']
which seems lacking on detail of where the validation error happened.
I am expecting to see multiple because the docs say
When structuring a class, cattrs will gather any exceptions on a field-by-field basis and raise them as a cattrs.ClassValidationError, which is a subclass of BaseValidationError.
I am doing something wrong, or this not a feature of cattrs?
- 主要语言
- Python
- 星标
- 1.1k
- 派生
- 171
- 平均合并
- 14 小时 46 分钟
- 30 天内合并 PR
- 5
环境准备
- 没有 Dockerfile 或 Docker Compose 文件
- 没有 Pull Request 模板
- 阅读贡献指南
从这里开始
- 先读完整个 Issue，再读项目的贡献指南。
- 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
- Fork 仓库，在一个分支上完成修改。
- 提交 Pull Request，并在描述里引用这个 Issue 编号。
python-attrs/cattrs 的其他 Issue
-
Dataclass default_factory field treated as required in union disambiguation可能已有人在做 @Eryx-Z 于 2 天前认领。 未关闭
难度 2/5 1-3 小时 新手友好度 72/100
python-attrs/cattrs#796 ·
维护者通常 1 天内回复
-
decimal.Decimal not handled in preconf converters (json, pyyaml)可能已有人在做 @Binilkks 于 114 天前认领。 未关闭
难度 2/5 1-3 小时 新手友好度 72/100
python-attrs/cattrs#761 · 2 条评论 ·
维护者通常 1 天内回复
-
难度 2/5 1-3 小时 新手友好度 64/100
python-attrs/cattrs#513 · 4 条评论 ·
维护者通常 1 天内回复
-
Structure hook on a PEP 695 alias is ignored inside a passthrough union可能已有人在做 @Eryx-Z 于 2 天前认领。 未关闭
难度 3/5 1-2 天 新手友好度 62/100
python-attrs/cattrs#797 ·
维护者通常 1 天内回复
-
msgspec converter skips hooks and drops private fields in nested recursion可能已有人在做 @Gabrieljr42 于 2 天前认领。 未关闭
难度 3/5 半天 新手友好度 64/100
python-attrs/cattrs#795 · 1 条评论 ·
维护者通常 1 天内回复
查看 python-attrs/cattrs 的全部 Issue
相似的 Issue
-
难度 2/5 1-3 小时 新手友好度 77/100
维护者通常 1 天内回复
-
难度 2/5 1-3 小时 新手友好度 76/100
维护者通常 1 天内回复
-
难度 2/5 1-3 小时 新手友好度 67/100
webrecorder/warcio#209 ·
-
bug
难度 2/5 1-3 小时 新手友好度 76/100
Jeffy123-zhu/logspecter#20 ·
-
难度 1/5 1 小时以内 新手友好度 85/100
维护者通常 1 天内回复