Support multiple-path resources with same resource model in MPG generator

[Copilot]

Description

The MPG emitter previously keyed resource metadata by model ID alone, causing methods from different resource paths sharing the same model to merge incorrectly. This prevented scenarios like the typespec-azure legacy-operations pattern where two interfaces (BestPractices, BestPracticeVersions) use the same model (BestPractice) at different paths.

Changes

Emitter (resource-detection.ts)

• Track resources by modelId + resourcePath instead of model ID alone
• Derive resource names from interface names when multiple paths exist (e.g., Practices → Practice, PracticeVersions → PracticeVersion)
• Enhanced list operation matching to associate correctly across scopes (subscription vs resource group)
• Auto-merge entries without resource ID patterns
• Fixed linter error: removed unused variable

Tests

• Added test case for multiple resources sharing properties
• Added multiplepaths.tsp demonstrating parent/child resources
• All 27 emitter tests passing

Test Project

• Regenerated test project in correct location (src/Generated)
• Removed temporary tsp-output folder

Example

TypeSpec defining two resources sharing the same properties:

model Practice is ProxyResource<PracticeProperties> {
  ...ResourceNameParameter<Practice>;
}

@parentResource(Practice)
model PracticeVersion is ProxyResource<PracticeProperties> {
  ...ResourceNameParameter<PracticeVersion>;
}

@armResourceOperations
interface Practices {
  get is ArmResourceRead<Practice>;
}

@armResourceOperations
interface PracticeVersions {
  get is ArmResourceRead<PracticeVersion>;
}

Now generates separate PracticeResource and PracticeVersionResource classes with distinct paths:

• /providers/.../practices/{practiceName}
• /providers/.../practices/{practiceName}/practiceVersions/{practiceVersionName}

---

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• Please add REST spec PR link to the SDK PR
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Testing Guidelines

• Pull request includes test coverage for the included changes.

SDK Generation Guidelines

• If an SDK is being regenerated based on a new swagger spec, a link to the pull request containing these swagger spec changes has been included above.
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• The *.csproj and AssemblyInfo.cs files have been updated with the new version of the SDK.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Support multiple-path resource with same resource model in new MPG generator</issue_title>
<issue_description>Example of 2 resources sharing the same resource model:
https://github.com/Azure/typespec-azure/blob/32292dabd9a4741b02a211fe3838a7279961f690/packages/samples/specs/resource-manager/legacy/legacy-operations/main.tsp#L83-L107

Update emitter to get resource name information to be able to generate 2 resources sharing same resource data correctly.
Update spec in mgmt test to verify this scenario.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Support multiple-path resource with same resource model in new MPG generator #54186

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[live1206]

@copilot fix linter error:
/mnt/vss/work/1/s/eng/packages/http-client-csharp-mgmt/emitter/src/resource-detection.ts
106:36 error '' is assigned a value but never used @typescript-eslint/no-unused-vars

[live1206]

remove the output folder
Re-generate mgmt test to update generated code in https://github.com/Azure/azure-sdk-for-net/tree/main/eng/packages/http-client-csharp-mgmt/generator/TestProjects/Local/Mgmt-TypeSpec/src/Generated

[Copilot]

Done in commit 676fb72. Removed the tsp-output folder and regenerated the test project. Generated code is now in src/Generated including the new Practice and PracticeVersion resources.

[Copilot]

@copilot fix linter error:
/mnt/vss/work/1/s/eng/packages/http-client-csharp-mgmt/emitter/src/resource-detection.ts
106:36 error '' is assigned a value but never used @typescript-eslint/no-u...

Fixed in commit 676fb72. Removed the unused variable _ from the for-of loop.

[live1206]

@copilot The scenario is not the same as https://github.com/Azure/typespec-azure/blob/32292dabd9a4741b02a211fe3838a7279961f690/packages/samples/specs/resource-manager/legacy/legacy-operations/main.tsp#L49-L107
we should use Azure.ResourceManager.Legacy.LegacyOperations, and there should be 2 resources sharing the same model.