fix(go): form-encode filter operator arrays as a single field

[cb-alish]

Summary

templates/go/v3/util.go.hbs index-encodes array-valued filter operators, so updated_at[between] is sent as [between][0] / [between][1] — which the API rejects with param_wrong_value. The same branch also drops the parent prefix when recursing into a nested array, losing the sub-resource path.

chargebee-go fixed this in v3.52.1 (chargebee/chargebee-go#87), but the fix lives in util.go, which this template overwrites on every regen — so the bug comes straight back. The sample validator has kept failing on export_subscription_ramps with Missing required form field: ramp[effective_from][between] for exactly that reason, while go-v4 (which has no serializer template) passes. This ports the released patch so generated SDKs keep it.

Node, PHP and go-v4 need no equivalent change: their serializers exist only in the SDK repos, so those fixes already survive regen.

Test plan

• Regenerated the go v3 SDK from chargebee_sdk_spec.json with this template onto chargebee-go@v3, then ran the SDK's own suite: go test ./tests/... passes, including the SerializeParams regression cases for between and for arrays nested in a sub-resource.
• Ran the generated export_subscription_ramps sample against a local echo server with that SDK: it sends ramp[effective_from][between]=["1704067200","1717199999"] as a single field, which is what the validator expects (it compares array elements as strings).
• Confirmed the regenerated util.go is byte-identical to the released v3.52.1 util.go through the serializer section.

Made with Cursor

Updated the Go v3 utility template to JSON-encode non-empty in, not_in, and between arrays as single form fields. Preserved prefixes for nested arrays, omitted empty filters, and added serialization error handling. This prevents regeneration from reintroducing the filter encoding defect.

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[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Enterprise

Run ID: 05c0a60b-0810-431f-a579-a0978ebd3382

📥 Commits

Reviewing files that changed from the base of the PR and between e335505 and 660dd28.

📒 Files selected for processing (1)

• src/main/resources/templates/go/v3/util.go.hbs

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Walkthrough

The Go template now serializes in, not_in, and between arrays as JSON fields. It omits empty operator filters, preserves indexed serialization for other arrays, and logs JSON serialization errors.

Changes

Go array operator serialization

Layer / File(s)	Summary
Operator serialization and map parsing src/main/resources/templates/go/v3/util.go.hbs	The template recognizes in, not_in, and between. It serializes non-empty values as JSON string arrays, omits empty filters, and retains indexed handling for other arrays. Serialization errors are logged and return an empty string.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 1

✅ Passed checks (1 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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