:safety_vest: Update implementarion and docs for RequestValidationError in pydantic v2

[tamird]

Update the documentation to explain that RequestValidationError isn't literally a subclass since Pydantic V2.

Closes #10424. Closes #11176.

[tiangolo]

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[tamird]

@tiangolo this is green now. I believe it is technically a breaking change.

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[tamird]

@tiangolo ping - would you mind having a look please?

[tamird]

@alejsdev could you please have a look? What is the process for getting a review?

[tamird]

@tiangolo ping

[bertomaniac]

I think this PR will actually fix the issue I described here: https://github.com/fastapi/fastapi/discussions/11923

The extra input and ctx fields that come out of pydantic v2 ValidationError.errors() is causing problems when serializing that data back in fastapi.

[tamird]

3 months and no review :(

[bertomaniac]

Dang, I just checked out your PR and tried it for my test. It doesn't fix it because I think this code block still needs to strip out ctx and input from pydantic v2s ValidationError.errors() call:

            except ValidationError as exc:
                errors: List[ErrorDetails] = [
                    {**err, "loc": loc + err.get("loc", ())}  # type: ignore [typeddict-unknown-key]
                    for err in exc.errors(include_url=False)
                ]
                return None, errors

perhaps

for err in exc.errors(include_url=False, include_input=False, include_context=False)

See here in pydantic docs: https://docs.pydantic.dev/latest/api/pydantic_core/#pydantic_core.ValidationError.errors

[estebanx64]

Hi @tamird 👋

We'll be reviewing this PR soon. 🤓

Thank you for your interest and time in helping us with your contribution 🙇

[github-actions[bot]]

📝 Docs preview for commit 3f38cf372997e15ebeca5dff4388fd6654fea3d9 at: https://5ba594db.fastapitiangolo.pages.dev

Modified Pages

• https://5ba594db.fastapitiangolo.pages.dev/tutorial/handling-errors/

[tamird]

I have rebased this to resolve the merge conflicts.

[github-actions[bot]]

📝 Docs preview for commit 39429c16d17c5be4769e8b1e8f07454a14b11c06 at: https://e052a695.fastapitiangolo.pages.dev

Modified Pages

• https://e052a695.fastapitiangolo.pages.dev/tutorial/handling-errors/

[tamird]

@estebanx64 ping.