refactor: simplify WriteApi request path

[bednar]

Summary

• Replace generated OpenAPI request plumbing with focused request construction and direct RestClient transport.
• Preserve v2/v3 endpoint selection, precision conversion, gzip, timeout, retry, and error translation behavior.
• Update request-path and Polars tests to assert the RestClient boundary.

Testing

• venv/bin/python -m pytest tests -q -m 'not integration' — 174 passed, 29 deselected
• venv/bin/flake8 influxdb_client_3/write_client/client/write_api.py tests/test_write_api.py tests/test_polars.py
• Integration marker suite: 29 skipped because the integration environment is unavailable.

Closes #229

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.59%. Comparing base (4b3549c) to head (554d0cd).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #237      +/-   ##
==========================================
- Coverage   86.90%   83.59%   -3.31%     
==========================================
  Files          28       28              
  Lines        2084     2030      -54     
==========================================
- Hits         1811     1697     -114     
- Misses        273      333      +60     

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[Copilot]

Pull request overview

This PR refactors the internal WriteApi write path to construct v2/v3 write requests directly and send them through the internal RestClient, removing leftover generated OpenAPI request plumbing while preserving existing write behaviors and updating tests to assert the RestClient boundary.

Changes:

• Replace generated-style request preparation (call_api / _post_write_prepare / serialization helpers) with _build_write_request(...) + _request(...) using RestClient.
• Update unit tests (including Polars) to validate request construction and mock rest_client.request instead of call_api.
• Update the changelog to mention the additional simplification of the WriteApi request path.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
influxdb_client_3/write_client/client/write_api.py	Removes generated OpenAPI request plumbing and routes write requests through _build_write_request + RestClient.
tests/test_write_api.py	Adds request-matrix coverage for _build_write_request and adjusts mocks to the RestClient boundary.
tests/test_polars.py	Updates Polars write tests to mock/assert rest_client.request calls and payload forwarding.
CHANGELOG.md	Notes further write-path simplification via direct RestClient request construction.

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[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

Suppressed comments (1)

Previously missed (1) — in code that hasn't changed since the last review.

influxdb_client_3/write_client/client/write_api.py:690

• _build_write_request raises errors that say "when calling _post_write", but the validation is happening inside _build_write_request. Using the correct method name makes errors clearer, especially when this helper is called directly in tests or from post_write_async.

        if org is None:
            raise ValueError("Missing the required parameter `org` when calling `_post_write`")
        if bucket is None:
            raise ValueError("Missing the required parameter `bucket` when calling `_post_write`")

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated no new comments.

[karel-rehor]

A question regarding how this is documented in CHANGELOG.md needs to be clarified. Will continue with reviewing other changes.

[karel-rehor]

I see the changes in this PR are being documented as part of release 0.21.0, which was released last week. Are we planning to re-release 0.21.0? Or should this PR and its changes be added to the 0.22.0 release cycle?

This addendum to last week's release could lead users to understand that functionality has changed in 0.21.0, when in fact the change will only be available in 0.22.0.

[bednar]

Fixed - updated 0.22.0 changelog.

[karel-rehor]

Tests pass locally. These changes make reading the Write API cleaner and clearer.

Looks good to me. 🚴 🏁

N.B. just noticed loss of test coverage. Maybe we want to add one or two new unit tests. But not a blocker for me.