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Support x-keep-typed-in-additional-properties in Rust model generator#1730

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czhang/typed-fields-in-additional-properties
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Support x-keep-typed-in-additional-properties in Rust model generator#1730
charlie-zhang109 wants to merge 4 commits into
masterfrom
czhang/typed-fields-in-additional-properties

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What does this PR do?

When a schema sets x-keep-typed-in-additional-properties: true (introduced in DataDog/datadog-api-spec#5941), the Rust model generator pre-inserts every JSON key into additional_properties before the match dispatch in deserialize. Previously, only the &_ catch-all arm (unknown keys) populated the map.

The first consumer is UsageSummaryDate, UsageSummaryDateOrg, and UsageSummaryResponse. After this change, every field on those models is accessible from additional_properties regardless of when it was added to the spec.

Typed field accessors are unchanged — this is additive only.

Companion PRs:

Review checklist

  • This PR includes all newly recorded cassettes for any modified tests.

  • This PR does not rely on API client schema changes.

    • The CI should be fully passing.
  • Or, this PR relies on API schema changes and this is a Draft PR to include tests for that new functionality.

charlie-zhang109

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@charlie-zhang109 charlie-zhang109 marked this pull request as ready for review June 8, 2026 15:23
@charlie-zhang109 charlie-zhang109 requested review from a team as code owners June 8, 2026 15:23
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@charlie-zhang109 charlie-zhang109 force-pushed the czhang/typed-fields-in-additional-properties branch from 251b075 to 0881758 Compare June 11, 2026 12:25
charlie-zhang109 and others added 3 commits June 12, 2026 14:01
When a schema sets `x-keep-typed-in-additional-properties: true`, pre-insert
every key into `additional_properties` before the match dispatch so typed and
untyped fields are both accessible from a single map.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
…rde_json::Value

Add inline comment explaining that deserializing into serde_json::Value always
succeeds, so the Ok branch always fires. The guard future-proofs against typed
additionalProperties schemas where the conversion could fail.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
…comment

"future-proofs" implied graceful handling; the comment now accurately notes
that a type mismatch silently drops the entry, same as the catch-all arm.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
@charlie-zhang109 charlie-zhang109 force-pushed the czhang/typed-fields-in-additional-properties branch from 0881758 to e78662b Compare June 12, 2026 18:01
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