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Fix various warnings from pydantic >= 2.10#29

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cjwatson wants to merge 3 commits intopyapp-kit:mainfrom
cjwatson:pydantic-2.10
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Fix various warnings from pydantic >= 2.10#29
cjwatson wants to merge 3 commits intopyapp-kit:mainfrom
cjwatson:pydantic-2.10

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@cjwatson
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@cjwatson cjwatson commented Sep 2, 2025

These caused failures in Debian's CI.

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codecov bot commented Sep 2, 2025

Codecov Report

❌ Patch coverage is 77.77778% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 50.69%. Comparing base (103f757) to head (d1fc024).
⚠️ Report is 2 commits behind head on main.

Files with missing lines Patch % Lines
src/pydantic_compat/_v1/__init__.py 0.00% 1 Missing ⚠️
src/pydantic_compat/_v2/mixin.py 75.00% 1 Missing ⚠️

❌ Your patch check has failed because the patch coverage (77.77%) is below the target coverage (85.00%). You can increase the patch coverage or adjust the target coverage.

❗ There is a different number of reports uploaded between BASE (103f757) and HEAD (d1fc024). Click for more details.

HEAD has 467 uploads less than BASE
Flag BASE (103f757) HEAD (d1fc024)
472 5
Additional details and impacted files
@@             Coverage Diff             @@
##             main      #29       +/-   ##
===========================================
- Coverage   94.64%   50.69%   -43.95%     
===========================================
  Files           8        8               
  Lines         280      286        +6     
===========================================
- Hits          265      145      -120     
- Misses         15      141      +126     

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Otherwise we get:

```
pydantic.warnings.PydanticDeprecatedSince211: Accessing the 'model_fields' attribute on the instance is deprecated. Instead, you should access this attribute from the model class. Deprecated in Pydantic V2.11 to be removed in V3.0.
```
https://docs.pydantic.dev/latest/concepts/validators/#model-validators
says that "after" model validators are instance methods and should
return the validated instance.  The previous test code produced a
warning from pydantic >= 2.9.0:

```
UserWarning: A custom validator is returning a value other than `self`.
Returning anything other than `self` from a top level model validator isn't supported when validating via `__init__`.
See the `model_validator` docs (https://docs.pydantic.dev/latest/concepts/validators/#model-validators) for more details.
```
@cjwatson
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cjwatson commented Sep 2, 2025

My last commit here is for pydantic 2.12.0a1, but it's broken on some earlier versions and I don't quite know how to fix it.

pydantic 1 requires model validators to have cls as their first parameter. pydantic >= 2.9 documents that model validators should return self, and raises a warning if they don't. pydantic >= 2.12.0a1 stops automatically converting "after" validators to class methods (pydantic/pydantic#11957). The combination of all these things makes it difficult to see how to retain compatibility with all versions.

Do you have any bright ideas?

@tlambert03
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thanks @cjwatson. If you primarily want this for pyapp-kit/app-model#235, then I agree with you over there that just dropping pydantic1 is the right approach, (see pyapp-kit/app-model#263)

this repo should be largely considered in maintenance mode... so one possibility here, if we just want to get tests passing, is to not be so strict about tests warnings and remove this line:

filterwarnings = ["error"]

alternatively, can you tell me more about the exact failures in Debian's CI?

@cjwatson
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cjwatson commented Sep 2, 2025

The only thing that depends on pydantic-compat in Debian is app-model. If that drops its dependency, then we can just drop pydantic-compat - I don't think Debian has any particular interest in it for its own sake.

The failures are visible in e.g. https://ci.debian.net/packages/p/pydantic-compat/testing/amd64/64021592/ if you're interested.

@cjwatson
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FWIW, we removed this package from Debian (after Debian 13).

@tlambert03
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Thanks! Seems reasonable to me 👍

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