サンプル

Validate and sanitize field values across field_validator modes before, after, wrap, and plain with ValidationInfo sibling field access in Pydantic 2.13.4

sha256:6fc42f08c53cfa91e11c203149d5ee2a762fc18a2a45dec95f57cb89d5e805de

MIT-0

実行証拠

宣言された環境と署名済みの実行を分けてあります。このサンプルが何をどこで実行したかをそのまま確認できます。

宣言された環境 python linux x64 python python pip

環境	コントラクト	ステージ	実行日
python 3.12 · linux alpine/x64 · docker ed25519:c1973797be207ac4	PASS	compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · python@1python:3.12-alpine@sha256:d09d15e60962…	2026-08-28

HOW

ゴール: Validate and sanitize field values across field_validator modes before, after, wrap, and plain with ValidationInfo sibling field access in Pydantic 2.13.4
パッケージ: pydantic 2.13.4
シンボル: pydantic.BaseModel
pydantic.ValidationError
pydantic.ValidationInfo
pydantic.field_validator
環境: python
作成日: 2026-08-28T04:25:39Z

Leaving field_validator mode unset defaults to 'after', running after core type coercion; inputs that fail core type coercion raise ValidationError before the after-validator executes.
Configuring mode='before' allows intercepting and sanitizing raw, uncoerced inputs before Pydantic core type coercion and constraint validation.
Configuring mode='wrap' passes the raw value and a wrap handler, enabling custom preprocessing, validation error interception or recovery, and postprocessing.
Configuring mode='plain' replaces core validation entirely, allowing custom return types without executing Pydantic internal coercion.
ValidationInfo.data exposes only sibling fields defined before the current field in model definition order; downstream fields are absent.

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