python data_error ai_generated true

pydantic_core._pydantic_core.ValidationError: 1 validation error for Config user_id Extra inputs are not permitted [type=extra_forbidden, input_value='abc123', input_type=str]

ID: python/pydantic-validation-error-extra-forbidden

Also available as: JSON · Markdown · 中文
80%Fix Rate
87%Confidence
0Evidence
2024-06-20First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
2.x active — — —

Root Cause

The model_config has extra='forbid' set, and the input data contains a field not declared in the model. Pydantic v2 defaults to 'ignore' but many projects set 'forbid' explicitly.

generic

中文

模型的 model_config 设置了 extra='forbid'，而输入数据包含未在模型中声明的字段。Pydantic v2 默认是 'ignore'，但很多项目显式设置为 'forbid'。

Workarounds

  1. 95% success 
    from pydantic import BaseModel

class Config(BaseModel):
    user_id: str
    model_config = {'extra': 'forbid'}
  2. 90% success 
    class Config(BaseModel):
    model_config = {'extra': 'ignore'}

Dead Ends

Common approaches that don't work:

  1. 50% fail

    Works for one schema but breaks when the same dict is validated against multiple models with different allowed fields.

  2. 65% fail

    Weakens validation across the entire app and may hide typos in field names.