python data_error ai_generated true

pydantic_core._pydantic_core.ValidationError: 账户模型验证错误：username 字符串长度至少为 3 个字符

pydantic_core._pydantic_core.ValidationError: 1 validation error for Account username String should have at least 3 characters [type=string_too_short, input_value='ab', input_type=str]

ID: python/pydantic-validation-error-string-too-short

其他格式: JSON · Markdown 中文 · English
80%修复率
88%置信度
0证据数
2024-04-02首次发现

版本兼容性

版本状态引入弃用备注
2.x active — — —

根因分析

字符串字段设置了 min_length 约束，但提供的值长度不足。

English

A string field has a min_length constraint and the provided value is shorter than required.

generic

解决方案

  1. 95% 成功率 
    from pydantic import BaseModel, Field

class Account(BaseModel):
    username: str = Field(min_length=3)

# caller side
try:
    Account(username='ab')
except ValidationError as e:
    print(e.errors())
  2. 85% 成功率 
    username: str = Field(min_length=2)

无效尝试

常见但无效的做法:

  1. 75% 失败

    Leading/trailing spaces may pass length checks but produce invalid usernames and break downstream uniqueness checks.

  2. 60% 失败

    Weakens data integrity; empty or one-character usernames may break UI or DB constraints.