pythonasyncioapiasyncfastapiframeworkjsonjson-schemaopenapiopenapi3pydanticpython-typespython3redocreststarletteswaggerswagger-uiuvicornweb
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add-tests-for-parameter-defaults
check-zh-translation-prompt
fix-broken-links-in-index.md
fix-links
fix-multiple-upload-file-in-swagger
fix-nested-annotated-types-in-field_annotation_is_scalar_sequence
fix-response_model_---parameters-with-Iterable
master
pin-actions-by-sha
translate-de-add-missing-3f9149da
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translate-zh-add-missing-6eac157d
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v0.1.16
${ noResults }
tiangolo.fastapi/fastapi/dependencies
Abhishek Biswas
e07f5dea76
Fixes #13533 This fixes regressions in form handling where empty strings in form fields were incorrectly treated as values instead of using default values for optional fields. ## Problem When form fields with Optional types and None defaults received empty strings (""), FastAPI incorrectly treated them as empty string values instead of using the default value (None). This affected both: - x-www-form-urlencoded forms - multipart/form-data forms This regression broke existing applications when upgrading from v0.112.4 to v0.115.x. ## Solution Modified the _extract_form_body function in fastapi/dependencies/utils.py: 1. Track defined body_field aliases to distinguish between declared fields and extra fields 2. Don't add empty strings for Form fields since _get_multidict_value already handles them correctly by returning default values 3. Only add extra fields from received_body that are not already defined as body_fields to prevent overwriting correctly processed default values ## Tests - Added comprehensive regression tests in tests/test_forms_empty_string_default_13533.py - All existing form-related tests pass (verified 20+ tests) - Python 3.8+ compatible (uses typing_extensions.Annotated) |
9 months ago | |
|---|---|---|
| .. | ||
| __init__.py | ♻️ Refactor, fix and update code | 8 years ago |
| models.py | ♻️ Refactor and simplify dependencies data structures with dataclasses (#12098) | 2 years ago |
| utils.py | 🐛 Fix form validation regression with empty string default values | 9 months ago |