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✨ Add support for from pydantic.v1 import BaseModel, mixed Pydantic v1 and v2 models in the same app #14168

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tiangolo merged 66 commits into from
Oct 11, 2025
Merged

✨ Add support for from pydantic.v1 import BaseModel, mixed Pydantic v1 and v2 models in the same app #14168

tiangolo merged 66 commits into from
Oct 11, 2025
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@tiangolo tiangolo commented Oct 8, 2025 •
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✨ Add support for from pydantic.v1 import BaseModel, mixed Pydantic v1 and v2 models in the same app

tiangolo added 28 commits October 4, 2025 21:26
@tiangolo
♻️ Refactor _compat, prepare compatibility for Pydantic v1 in v2
ac47072
@tiangolo
♻️ Refactor internals to use new _compat utils
22a1cca
@tiangolo
♻️ Duplicate params for v1 compatibility
f6b2f22
@tiangolo
♻️ Update and refactor main module in _compat
04ed076
@tiangolo
✨ Add util to check if annotation is Pydantic v1
a83cd00
@tiangolo
♻️ Refactor _compat.v1 module
6c4ec85
@tiangolo
♻️ Refactor internals to use new compat utils for v1
7cd3a71
@tiangolo
✅ Update tests for compat
cb28e5d
@tiangolo
✅ Add first tests for Pydantic v1 in v2
0b2faed
@tiangolo
✅ Extend test for Pydantic v1 with submodels
bd660ea
@tiangolo
✅ Update tests and URL paths
fc5932e
@tiangolo
✅ Add tests for Pydantic v1 lists
db96db4
@tiangolo
♻️ Tweak _compat to account for lists of models
0d4d7d2
@tiangolo
✅ Update tests for mixing Pydantic v1 and v2 models
7960130
@tiangolo
✅ Add tests for Noneable fields
f9b5c48
@tiangolo
🐛 Fix import in _compat
4a60fa8
@tiangolo
🐛 Handle creating ModelField in v1 when v2 is not installed
a63e1a5
@tiangolo
✅ Fix test using _compat
c0863b2
@tiangolo
✅ Add snapshots for tests in Pydantic v1
f5998c5
@tiangolo
✅ Add snapshots for Pydantic v2 tests
ab242c6
@tiangolo
♻️ Tweak implementation and tests for coverage
aa58482
@tiangolo
✅ Add tests for models with multiple paths
9030eed
@tiangolo
✅ Update tests, separate schemas for models with the same name in dif…
e1eedaf 
…ferent files for v1 and v2
@tiangolo
♻️ Add Pydantic v1 schema functions to v2 _compat to allow generating…
658c260 
… JSON Schema for all together
@tiangolo
✅ Update snapshots for Pydantic v1 and v2
803ca5f
@tiangolo
♻️ Tweak types
097dfc0
@tiangolo
♻️ Update getting model types from annotations
09bba35
@tiangolo
✅ Remove unnecessary test
0a21282
@tiangolo tiangolo changed the title ✨ Add support for using Pydantic v2's v1: from pydantic.v1 import BaseModel, mixed with Pydantic v2 in the same app ✨ Add support for from pydantic.v1 import BaseModel, mixed Pydantic v1 and v2 models in the same app Oct 8, 2025
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github-actions bot commented Oct 10, 2025 •
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📝 Docs preview

Last commit 49d1911 at: https://b4f3f2a7.fastapitiangolo.pages.dev

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@tiangolo tiangolo marked this pull request as ready for review October 11, 2025 09:16
@tiangolo tiangolo merged commit d34918a into master Oct 11, 2025
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@tiangolo tiangolo deleted the pv2-v1 branch October 11, 2025 16:45
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tiangolo commented Oct 11, 2025

This was just released in FastAPI 0.119.0 🎉

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@josix josix mentioned this pull request Oct 12, 2025
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@tamird tamird mentioned this pull request Oct 12, 2025
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@tiangolo tiangolo mentioned this pull request Oct 13, 2025
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This was referenced Oct 14, 2025
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nilslindemann added a commit to nilslindemann/fastapi that referenced this pull request Oct 14, 2025
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Sync German docs with fastapi#14168
e1a5922
@cutoffthetop cutoffthetop mentioned this pull request Oct 15, 2025
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cutoffthetop added a commit to robert-koch-institut/mex-backend that referenced this pull request Oct 15, 2025
@cutoffthetop
feature/lock fastapi to 0.118 (#416)
f9fdd04 
### PR Context

- fastapi/fastapi#14168 breaks our swagger

### Changes

- temporarily lock fastapi to 0.118
@nsoranzo nsoranzo mentioned this pull request Oct 16, 2025
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YuriiMotov added a commit that referenced this pull request Oct 20, 2025
@nilslindemann @YuriiMotov
🌐 Sync German docs (#14188)
8472804 
Sync German docs with #14168

Co-authored-by: Motov Yurii <109919500+YuriiMotov@users.noreply.github.com>
@vincentsarago vincentsarago mentioned this pull request Oct 21, 2025
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@pintudinesh-1912 pintudinesh-1912 mentioned this pull request Oct 27, 2025
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@Menad-doctolib Menad-doctolib mentioned this pull request Nov 6, 2025
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@YuriiMotov YuriiMotov mentioned this pull request Nov 29, 2025
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