Generate a request object for all resource methods in Go v4

[cb-srinaths]

This PR introduces a breaking change to the Go v4 SDK. It generates a request object for all methods which previously only had a single id string as a parameter - which lets consuming apps define custom request headers/context/etc on those requests.

// Before
res, err := client.Subscription.Retrieve("sub_1")

// After
res, err := client.Subscription.Retrieve(&chargebee.SubscriptionRetrieveRequest{Id: "sub_1"})

Introduces breaking request-object support for Go v4 resource methods that previously accepted only an ID. Updates generation logic, templates, completion helpers, and tests to support custom headers, context, and request options.

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Reviewing files that changed from the base of the PR and between 090b13b and ce8acdc.

📒 Files selected for processing (1)

• src/test/java/com/chargebee/sdk/go/v4/Go_V4RequestObjectTest.java

💤 Files with no reviewable changes (1)

• src/test/java/com/chargebee/sdk/go/v4/Go_V4RequestObjectTest.java

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Walkthrough

Go v4 generation now distinguishes ID arguments from request objects for path, body, and query inputs. Path-only operations receive typed request structs. Export and time-travel retrieval helpers pass typed requests.

Changes

Go v4 request-object generation

Layer / File(s)	Summary
Operation metadata and argument classification src/main/java/com/chargebee/sdk/go/v4/Go_V4.java, src/main/java/com/chargebee/sdk/go/v4/model/Operation.java	Operation metadata records path-only actions and selects ID and request arguments.
Typed request and service generation src/main/resources/templates/go/v4/models.go.hbs, src/main/resources/templates/go/v4/services.go.hbs	Templates generate path-only request types with Id and use request or ID arguments for path construction and request initialization.
Retrieval request integration and validation src/main/resources/templates/go/v4/export.go.hbs, src/main/resources/templates/go/v4/timeMachine.go.hbs, src/test/java/com/chargebee/sdk/go/v4/Go_V4RequestObjectTest.java	Retrieval helpers pass typed request objects. Tests validate signatures, paths, request metadata, payloads, and no-input behavior.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: 🟡 Moderate · up to ce8ac

The PR changes generated Go v4 methods to accept request objects, but its added validation appears to depend on migration artifacts that the generation path does not produce; the test may therefore fail, so the change is not merge-ready until the test or generation path is aligned.

Sequence Diagram(s)

sequenceDiagram
  participant Go_V4
  participant Operation
  participant GoTemplates
  participant GeneratedGoService
  participant Go_V4RequestObjectTest

  Go_V4->>Operation: classify path, body, and query inputs
  Operation->>GoTemplates: provide hasOnlyPathParam, hasIdArg, and hasRequestArg
  GoTemplates->>GeneratedGoService: generate request types and service methods
  GeneratedGoService->>Go_V4RequestObjectTest: produce generated Go output
  Go_V4RequestObjectTest->>Go_V4RequestObjectTest: verify signatures, paths, metadata, payloads, and no-input behavior

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🚥 Pre-merge checks | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 9.09% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 11 functions across 3 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

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Actionable comments posted: 1

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Inline comments:
In `@src/test/java/com/chargebee/sdk/go/v4/Go_V4RequestObjectTest.java`:
- Around line 147-158: The test must generate the migration module before
reading its files. Update the setup around Language.generate and
Go_V4.generateSDK to invoke the migration generator, then retain the assertions
for /migrate/go.mod, analyzer.go, main.go, and README.md.

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Configuration used: Organization UI

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Run ID: 24136e69-3383-4025-b121-a31ba779244f

📥 Commits

Reviewing files that changed from the base of the PR and between 4939173 and 090b13b.

📒 Files selected for processing (7)

• src/main/java/com/chargebee/sdk/go/v4/Go_V4.java
• src/main/java/com/chargebee/sdk/go/v4/model/Operation.java
• src/main/resources/templates/go/v4/export.go.hbs
• src/main/resources/templates/go/v4/models.go.hbs
• src/main/resources/templates/go/v4/services.go.hbs
• src/main/resources/templates/go/v4/timeMachine.go.hbs
• src/test/java/com/chargebee/sdk/go/v4/Go_V4RequestObjectTest.java

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