summercms/.planning/quick/261006-seq-fix-nullable-pointer-scalars-rendering-a/261006-seq-SUMMARY.md

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phase	plan	subsystem	tags	status	requires	provides	affects	tech-stack	key-files	decisions	metrics	actuals	plan_head_before	plan_head_after
quick-261006-seq	01	cabana	cabana ml hydration nullable reflect	complete		hostScalarString dereferences pointer host columns at any depth; nil becomes empty string	Any mltext/mlmarkdown field backed by a nullable pointer GORM column (Journal Categories -> Description)	added patterns reflect pointer walk before stringifying projected host values	created modified modules/cabana/ml_nullable_test.go modules/cabana/field_ml.go	Fix lives in cabana hostScalarString, not plugin YAML; save path (liftMLValues -> lagoon.Fill) left unchanged and only pinned by the round-trip test String kinds return raw text via reflect.Value.String(), bypassing any String() method on named string types	duration completed ~5 min 2026-10-06	tokens tasks commits 2400 2 2	8e22e5f25b	4f7e69fd2b

Quick 261006-seq Plan 01: Fix nullable pointer scalars rendering in ML hydration Summary

hostScalarString now walks pointers through reflect, so an mltext field on a nullable *string column hydrates to "" or to its text. Before the fix it showed "<nil>" or a heap address such as 0x36b66873bb0.

Tasks

Task	Name	Commit	Files
1	Round-trip regression for a *string mltext field, then dereference pointers in hostScalarString	90b87d6	modules/cabana/field_ml.go, modules/cabana/ml_nullable_test.go
2	Unit tests for hostScalarString and DB-free hydrateMLRecord over pointer scalars	4f7e69f	modules/cabana/ml_nullable_test.go

What changed

• modules/cabana/field_ml.go: hostScalarString returns "" for a nil interface. It then dereferences pointers at any depth and returns "" for a nil pointer at any depth. String kinds return their raw text, including named string types and bypassing their String() methods. Byte slices are decoded as text. Every other kind goes through fmt.Sprint of the dereferenced value, never of the pointer. A doc comment was added and reflect is now imported.
• modules/cabana/ml_nullable_test.go:
  • TestMLNullablePointerHost is a Postgres round trip with mlNullablePost.Description *string. It covers a nil host, a cleared value (stored as a pointer to "") and a filled value (the host text is stored and Polish goes through TranslationWriter).
  • TestHostScalarString has 19 table rows.
  • TestMLHydrationPointerHost calls hydrateMLRecord directly with a nil tx.

TDD evidence

RED: before the fix, TestMLNullablePointerHost failed with show description.en = "<nil>" and save description.en = "0x36b66873bb0". GREEN: it passes after the fix, and TestMLHydration, TestMLNestedSave and TestML still pass.

Verification

• go vet ./... is clean at both commits.
• go test ./... -count=1 is green at both commits, including the testcontainers cabana tests.
• gofmt -l modules/cabana prints nothing.
• The two commits touch only modules/cabana/field_ml.go and modules/cabana/ml_nullable_test.go. They change no README, docs or .planning files and carry no co-author trailers.

Deviations from Plan

None. The plan was executed as written. One small addition: the file-local nullableSlug type has a String() method that returns "decorated". The named-string rows therefore show that the raw stored text is returned, not the Stringer output.

Threat Flags

None. T-quick-261006-seq-01 is mitigated: tests assert that no hydrated value starts with 0x or contains <nil>.

Self-Check: PASSED

• FOUND: modules/cabana/field_ml.go
• FOUND: modules/cabana/ml_nullable_test.go
• FOUND: 90b87d6
• FOUND: 4f7e69f