python module_error ai_generated true

pydantic.errors.PydanticUserError: `@validator` 不能应用于实例方法。请改用 `@field_validator`。

pydantic.errors.PydanticUserError: `@validator` cannot be applied to instance methods. Use `@field_validator` instead.

ID: python/pydantic-deprecated-validator-v1

其他格式: JSON · Markdown 中文 · English
80%修复率
90%置信度
0证据数
2024-08-30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

Pydantic v2 移除了 v1 的 `@validator` 装饰器；使用它（或从 `pydantic` 顶层导入）会触发用户错误。

English

Pydantic v2 removed the v1 `@validator` decorator; using it (or importing from `pydantic` top-level) raises a user error.

generic

解决方案

  1. 95% 成功率 
    Replace `@validator('x')` with `@field_validator('x')` and `@classmethod`; note `values` dict becomes a second positional arg `info`.
  2. 90% 成功率 
    Use `@model_validator(mode='after')` for cross-field validation.

无效尝试

常见但无效的做法:

  1. 30% 失败

    Pinning to Pydantic v1 avoids the error but loses v2 performance and features.

  2. 50% 失败

    Importing `validator` from `pydantic.deprecated` works temporarily but emits DeprecationWarning and will be removed.