Fix loading after ActiveSupport 6 subclass extensions

[jbeckwith-oai]

Summary

• avoid Class#subclasses while registering generated model OrHash aliases because ActiveSupport 5 and 6 implement it through ==
• enumerate only direct BaseModel subclasses and compare their superclass by object identity
• add an isolated load-order regression test that reproduces ActiveSupport 6's implementation

Fixes #335.

Why this is narrow

This does not monkeypatch ActiveSupport or Ruby, and it does not change BaseModel.==. The identity-safe enumeration is local to generated model initialization.

Test plan

• ruby -Itest over the load-order, BaseModel, Sorbet runtime, and structured-output tests (25 runs, 326 assertions)
• load after real ActiveSupport 5.2.8.1, 6.0.6.1, 6.1.7.10, and 7.0.8.7 gems
• RuboCop on the changed Ruby files

Companion generator change: openai/openai#1237327.

[openai-sdks]

OkTest Summary

✅ 237/237 SDK tests passed in 9.718s for Ruby SDK PR #336.

Test results — 42 files

Test	Result	Time
tests/chat-completions-complex-body.test.ts	✅ Passed	210ms
tests/chat-completions-create.test.ts	✅ Passed	248ms
tests/chat-completions-stream.test.ts	✅ Passed	135ms
tests/files-content-binary.test.ts	✅ Passed	298ms
tests/files-create-multipart.test.ts	✅ Passed	253ms
tests/files-list-pagination.test.ts	✅ Passed	189ms
tests/initialize-config.test.ts	✅ Passed	173ms
tests/instance-isolation.test.ts	✅ Passed	254ms
tests/models-list.test.ts	✅ Passed	262ms
tests/responses-background-lifecycle.test.ts	✅ Passed	218ms
tests/responses-body-method-errors.test.ts	✅ Passed	490ms
tests/responses-cancel-timeout.test.ts	✅ Passed	272ms
tests/responses-cancel.test.ts	✅ Passed	306ms
tests/responses-compact-retries.test.ts	✅ Passed	290ms
tests/responses-compact.test.ts	✅ Passed	281ms
tests/responses-create-advanced-stream.test.ts	✅ Passed	219ms
tests/responses-create-advanced.test.ts	✅ Passed	189ms
tests/responses-create-disconnect.test.ts	✅ Passed	175ms
tests/responses-create-errors.test.ts	✅ Passed	403ms
tests/responses-create-malformed-api-responses.test.ts	✅ Passed	161ms
tests/responses-create-retries.test.ts	✅ Passed	300ms
tests/responses-create-stream-failures.test.ts	✅ Passed	148ms
tests/responses-create-stream-timeout.test.ts	✅ Passed	232ms
tests/responses-create-stream-wire.test.ts	✅ Passed	2.256s
tests/responses-create-stream.test.ts	✅ Passed	146ms
tests/responses-create-terminal-states.test.ts	✅ Passed	303ms
tests/responses-create-timeout.test.ts	✅ Passed	238ms
tests/responses-create.test.ts	✅ Passed	300ms
tests/responses-delete.test.ts	✅ Passed	237ms
tests/responses-input-items-errors.test.ts	✅ Passed	189ms
tests/responses-input-items-list.test.ts	✅ Passed	207ms
tests/responses-input-items-options.test.ts	✅ Passed	327ms
tests/responses-input-tokens-count-timeout.test.ts	✅ Passed	296ms
tests/responses-input-tokens-count.test.ts	✅ Passed	225ms
tests/responses-malformed-inputs.test.ts	✅ Passed	2.431s
tests/responses-not-found-errors.test.ts	✅ Passed	371ms
tests/responses-parse.test.ts	✅ Passed	211ms
tests/responses-retrieve-retries.test.ts	✅ Passed	323ms
tests/responses-retrieve.test.ts	✅ Passed	266ms
tests/responses-stored-method-errors.test.ts	✅ Passed	817ms
tests/retry-behavior.test.ts	✅ Passed	1.989s
tests/sdk-error-shape.test.ts	✅ Passed	513ms

View OkTest run #30948396049

_{SDK merge (f7515ce163ab) · head (5f5a53305938) · base (e3cbb6833713) · OkTest (91635c6a2723)}

[Copilot]

Pull request overview

This PR addresses a load-order failure when ActiveSupport 5/6 subclass/descendant extensions are loaded before openai, by avoiding code paths that invoke OpenAI::Internal::Type::BaseModel.== during model alias initialization.

Changes:

• Reworks generated model OrHash alias registration to avoid Class#subclasses and use superclass identity checks.
• Adds an isolated regression test that simulates ActiveSupport 6’s Class#descendants/#subclasses behavior and asserts require "openai" succeeds.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
test/openai/load_order_test.rb	Adds a subprocess-based regression test covering the ActiveSupport 6-style subclass extensions load-order scenario.
lib/openai/models.rb	Changes how BaseModel subclasses are enumerated for OrHash alias registration to avoid triggering structural equality during load.

---

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[HAYDEN-OAI]

Reviewed exact commit 5f5a533 and the complete implementation and load-order regression case. On MRI Ruby 3.3.12, verified SDK loading both without ActiveSupport and with real ActiveSupport 5.2.8.1, 6.0.6.1, 6.1.7.10, 7.0.8.7, 7.1.5, and 8.0.3. All 2,266 generated model classes receive OrHash aliases, and public structural class equality remains unchanged. Ruby singleton-class inheritance makes ObjectSpace.each_object(base_model.singleton_class) correctly enumerate descendant classes; the existing automated concern is a false positive. No substantive issues found.