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Title: Fix KeyError in fancy_model_dump for pydantic models with extra fields by Copilot · Pull Request #1689 · usethis-python/usethis-python · GitHub

Open Graph Title: Fix KeyError in fancy_model_dump for pydantic models with extra fields by Copilot · Pull Request #1689 · usethis-python/usethis-python

X Title: Fix KeyError in fancy_model_dump for pydantic models with extra fields by Copilot · Pull Request #1689 · usethis-python/usethis-python

Description: Pre-commit config files using prek syntax contain extra fields like priority: 0 on hooks and minimum_prek_version at the top level. These are accepted by our pydantic models (extra="allow"), but _fancy_model_dump_base_model crashes because for key, value in model: yields extra fields while model.model_fields[key] only contains declared fields. Fix In _fancy_model_dump_base_model, use model_fields.get(key) instead of model_fields[key] and branch: field_info = model.__class__.model_fields.get(key) if field_info is not None: # declared field: check defaults, aliases, reference diffing ... else: # extra field: always include, use raw key display_key = key Tests Unit tests (TestExtraFields): extra field inclusion, interaction with defaults/references, nested models Integration tests: add_repo against YAML with priority, minimum_prek_version, and arbitrary extra keys at top-level/repo/hook levels, verified via parsed YAML structure

Open Graph Description: Pre-commit config files using prek syntax contain extra fields like priority: 0 on hooks and minimum_prek_version at the top level. These are accepted by our pydantic models (extra="allow"...

X Description: Pre-commit config files using prek syntax contain extra fields like priority: 0 on hooks and minimum_prek_version at the top level. These are accepted by our pydantic models (extra="allow&...

Opengraph URL: https://github.com/usethis-python/usethis-python/pull/1689

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Fix KeyError in fancy_model_dump for pydantic models with extra fields https://github.com/usethis-python/usethis-python/pull/1689/files#top
Show all changes 4 commits https://github.com/usethis-python/usethis-python/pull/1689/files
5537254 Initial plan Copilot Apr 1, 2026 https://github.com/usethis-python/usethis-python/pull/1689/commits/5537254948391750d20cbdf155fbd0b2d4f5fc7f
75afb74 Fix KeyError in fancy_model_dump for extra pydantic fields (prek syntax) Copilot Apr 1, 2026 https://github.com/usethis-python/usethis-python/pull/1689/commits/75afb74c513bdb265fd71f9d234afe673423d23c
0e5a351 Strengthen integration tests with YAML parsing and fix lint issues Copilot Apr 1, 2026 https://github.com/usethis-python/usethis-python/pull/1689/commits/0e5a35103ebcde0c796d63572b3cbdbaeda2d1c4
b9d38c6 Run ruff format nathanjmcdougall Apr 1, 2026 https://github.com/usethis-python/usethis-python/pull/1689/commits/b9d38c620b226274dc7a8146b449a14708199608
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