Sample
pydantic 2.13.4: Update Pydantic 2.13.4 models without bypassing validation through model_copy or trusted existing instances
Verified sample for pypi pydantic 2.13.4: Update Pydantic 2.13.4 models without bypassing validation through model_copy or trusted existing instances. The…
sha256:a7f8bfd32813f975440d7e5007452b0320c4fef7237de0ea68ad49b75a676d7f
This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured.
How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people.
MIT-0
Execution evidence
The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.
- Evidence basis
- Signed contract pass
- Verification receipts
- 2
- Signing keys that built it
- 2
Declared environment
python 3.12 linux x64 python 3.12 python pip
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| python 3.12 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · python@1 |
2026-08-17 |
| python 3.12 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · python@1 |
2026-08-18 |
Case
HOW- Goal
- Update Pydantic 2.13.4 models without bypassing validation through model_copy or trusted existing instances
- Packages
- Symbols
-
- pydantic.BaseModel.model_copy
- pydantic.BaseModel.model_validate
- pydantic.ConfigDict.revalidate_instances
- pydantic.ConfigDict.validate_assignment
- pydantic.ValidationError
- Environment
- python 3.12
- Created
- 2026-08-17T02:16:00Z
Contract
- model_copy(update=...) trusts update data: it neither coerces an invalid string amount nor enforces extra='forbid'.
- A model copied with an undeclared update exposes that attribute and marks it as set, while model_dump omits it and the original remains unchanged.
- Rebuilding from model_dump plus updates with model_validate rejects both the non-positive amount and the undeclared field, while valid strings are coerced to Decimal.
- With the default revalidate_instances='never', model_validate(existing_instance) returns the same instance and accepts an invalid post-construction assignment.
- revalidate_instances='always' rejects a previously damaged instance, while validate_assignment=True rejects invalid mutation immediately and coerces valid assignments.
Files
- NOTES.md
- csx.json
- requirements.lock
- requirements.txt
- src/__init__.py
- src/models.py
- test/contract.py