TW-5091: nullable calendar color id fix

[googsvg]

Fixes issue #324

Introduces NullableField<T> to model three serialization states (omit / set / explicit null),
and adds UpdateEventRequest.Builder.clearColorId() which sends "color_id": null to the API.

Previously there was no way to clear an event color — null fields were silently dropped by Moshi.

License

I confirm that this contribution is made under the terms of the MIT license and that I have the authority necessary to make this contribution on behalf of its copyright owner.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 95.23810% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 82.74%. Comparing base (6b648b3) to head (e03921c).

Files with missing lines	Patch %	Lines
...tlin/com/nylas/util/NullableFieldAdapterFactory.kt	95.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #325      +/-   ##
============================================
+ Coverage     82.49%   82.74%   +0.25%     
- Complexity      358      361       +3     
============================================
  Files            38       39       +1     
  Lines          1034     1055      +21     
  Branches         95       99       +4     
============================================
+ Hits            853      873      +20     
  Misses          122      122              
- Partials         59       60       +1     

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[playerzero-ai]

PlayerZero

TW-5091-java-sdk-event-color-cannot-be-cleared-because-color-id-null-is-omitted-during-serialization → main

Change Summary

TW-5091: nullable calendar color ID fix

• Introduced NullableField<T> to represent three distinct request states:
  • null on the Kotlin model = omit field
  • NullableField.Value(v) = serialize a concrete value
  • NullableField.Clear = serialize explicit JSON null
• Added NullableFieldAdapterFactory and registered it in the shared JsonHelper Moshi stack so explicit clears survive serialization without changing global null-handling behavior.
• Updated UpdateEventRequest.colorId to use NullableField<String>? and added:
  • colorId("11") → sends "color_id": "11"
  • clearColorId() → sends "color_id": null
• Kept the change localized to the event update flow used by Events.update(...); create-event behavior and other request models are unchanged.
• Expanded tests to verify:
  • color_id is omitted when unset
  • color_id serializes normally when set
  • clearColorId() emits an explicit null payload for clearing the Google Calendar event color

updated: May 19 @ 07:51 PM UTC