python data_error ai_generated true

pydantic.error_wrappers.ValidationError: 1 validation error for Model field Field required [type=missing, input_value={}, input_type=dict]

ID: python/pydantic-required-field-missing

Also available as: JSON · Markdown · 中文
80%Fix Rate
88%Confidence
0Evidence
2024-02-10First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
2.x active — — —

Root Cause

A field without a default value is not provided during model instantiation, causing a missing field error.

generic

中文

实例化模型时未提供没有默认值的字段，导致缺少字段错误。

Workarounds

  1. 100% success 
    Provide the field during instantiation: Model(field='value')
  2. 95% success 
    Add a default value: field: str = 'default'

Dead Ends

Common approaches that don't work:

  1. 50% fail

    Setting default=None makes field optional, but if None is not valid for the type, it may still fail.

  2. 80% fail

    model_construct skips validation but may leave fields unset, causing issues later.