Fixes for non-stdlib dataclass-like types

[nkrishnaswami]

What does this PR do?

This PR includes a few small, related fixes for non-stdlib (possibly annotated) dataclasses and 3.12-style type aliases:

• Exclude non-init fields from attrs class instantiation.
• Exclude non-init fields from Pydantic 2 dataclass instantiation.
• Fix initialization for Pydantic 2 dataclasses with default values/factories.
• Look at underlying type for Annotated types where needed.
• Look at target for new TypeAliasType where needed. (This and the prior are commonly used with FastAPI)
• Tests showing the above were broken and are now fixed.

Before submitting

• Did you read the contributing guideline?
• Did you update the documentation? (readme and public docstrings)
• Did you write unit tests such that there is 100% coverage on related code? (required for bug fixes and new features)
• Did you verify that new and existing tests pass locally?
• Did you make sure that all changes preserve backward compatibility?
• Did you update the CHANGELOG? (not for typos, docs, test updates, or minor internal changes/refactors)

[nkrishnaswami]

A few annotations.

[nkrishnaswami]

Hmm, seeing errors on pydantic < 2.6; how far back do you need to support?

[nkrishnaswami]

Hmm, seeing errors on pydantic < 2.6; how far back do you need to support?

Sorted this out for 2.0+, but I am not sure how to set up the Pydantic v1 test environment

[mauvilsa]

@nkrishnaswami thank you for contributing! I haven't had time to look at this in detail, so I will comment more later. For the moment, I see that there is a test failing in test-py310-pydantic-v1. The changes introduced in pydantic v2 are big, which means that many people will still be using v1 for a long time. Please make sure that the test passes because there is no plan yet to drop support for pydantic v1.

[nkrishnaswami]

For the moment, I see that there is a test failing in test-py310-pydantic-v1. ... Please make sure that the test passes because there is no plan yet to drop support for pydantic v1.

@mauvilsa Gotcha. I was having trouble running the tests in my virtual env, but I found the commands to use in the circleci config; I'll get this fixed shortly!

[nkrishnaswami]

@mauvilsa got the tests and CI passing! Thanks!

[mauvilsa]

It is looking good. But some work is needed. See the comments.

[nkrishnaswami]

It is looking good. But some work is needed. See the comments.

Thanks for the feedback! I believe I have address these in the latest commit(s).

[nkrishnaswami]

That last set of fixes broke nested dataclasses on 3.12, and init=False on 3.7 for Pydantic dataclasses. (The version dependency is a surprise). I'll take a look at those tonight (UTC-5)

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

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