Fix some related content issues with content adapters

Fixes #13443

hugolib/page.go

@@ -151,6 +151,20 @@ func (p *pageState) Key() string {
 	return "page-" + strconv.FormatUint(p.pid, 10)
 }
 
+// RelatedKeywords implements the related.Document interface needed for fast page searches.
+func (p *pageState) RelatedKeywords(cfg related.IndexConfig) ([]related.Keyword, error) {
+	v, found, err := page.NamedPageMetaValue(p, cfg.Name)
+	if err != nil {
+		return nil, err
+	}
+
+	if !found {
+		return nil, nil
+	}
+
+	return cfg.ToKeywords(v)
+}
+
 func (p *pageState) resetBuildState() {
 	// Nothing to do for now.
 }

hugolib/page__common.go

@@ -68,7 +68,6 @@ type pageCommon struct {
 	page.PageMetaInternalProvider
 	page.Positioner
 	page.RawContentProvider
-	page.RelatedKeywordsProvider
 	page.RefProvider
 	page.ShortcodeInfoProvider
 	page.SitesProvider

hugolib/page__meta.go

@@ -27,8 +27,6 @@ import (
 	"github.com/gohugoio/hugo/markup/converter"
 	xmaps "golang.org/x/exp/maps"
 
-	"github.com/gohugoio/hugo/related"
-
 	"github.com/gohugoio/hugo/source"
 
 	"github.com/gohugoio/hugo/common/constants"
@@ -215,16 +213,6 @@ func (p *pageMeta) PathInfo() *paths.Path {
 	return p.pathInfo
 }
 
-// RelatedKeywords implements the related.Document interface needed for fast page searches.
-func (p *pageMeta) RelatedKeywords(cfg related.IndexConfig) ([]related.Keyword, error) {
-	v, err := p.Param(cfg.Name)
-	if err != nil {
-		return nil, err
-	}
-
-	return cfg.ToKeywords(v)
-}
-
 func (p *pageMeta) IsSection() bool {
 	return p.Kind() == kinds.KindSection
 }

hugolib/page__new.go

@@ -202,7 +202,6 @@ func (h *HugoSites) doNewPage(m *pageMeta) (*pageState, *paths.Path, error) {
 				ResourceParamsProvider:    m,
 				PageMetaProvider:          m,
 				PageMetaInternalProvider:  m,
-				RelatedKeywordsProvider:   m,
 				OutputFormatsProvider:     page.NopPage,
 				ResourceTypeProvider:      pageTypesProvider,
 				MediaTypeProvider:         pageTypesProvider,

hugolib/pagesfromdata/pagesfromgotmpl_integration_test.go

@@ -1,4 +1,4 @@
-// Copyright 2024 The Hugo Authors. All rights reserved.
+// Copyright 2025 The Hugo Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -23,6 +23,7 @@ import (
 	"github.com/gohugoio/hugo/markup/asciidocext"
 	"github.com/gohugoio/hugo/markup/pandoc"
 	"github.com/gohugoio/hugo/markup/rst"
+	"github.com/gohugoio/hugo/related"
 )
 
 const filesPagesFromDataTempleBasic = `
@@ -73,10 +74,11 @@ Pfile Content
 {{ $title := printf "%s:%s" $pd $pp }}
 {{ $date := "2023-03-01" | time.AsTime }}
 {{ $dates := dict "date" $date }}
+{{ $keywords := slice "foo" "Bar"}}
 {{ $contentMarkdown := dict "value" "**Hello World**"  "mediaType" "text/markdown" }}
 {{ $contentMarkdownDefault := dict "value" "**Hello World Default**" }}
 {{ $contentHTML := dict "value" "<b>Hello World!</b> No **markdown** here." "mediaType" "text/html" }}
-{{ $.AddPage  (dict "kind" "page" "path" "P1" "title" $title "dates" $dates "content" $contentMarkdown "params" (dict "param1" "param1v" ) ) }}
+{{ $.AddPage  (dict "kind" "page" "path" "P1" "title" $title "dates" $dates "keywords" $keywords "content" $contentMarkdown "params" (dict "param1" "param1v" ) ) }}
 {{ $.AddPage  (dict "kind" "page" "path" "p2" "title" "p2title" "dates" $dates "content" $contentHTML ) }}
 {{ $.AddPage  (dict "kind" "page" "path" "p3" "title" "p3title" "dates" $dates "content" $contentMarkdownDefault "draft" false ) }}
 {{ $.AddPage  (dict "kind" "page" "path" "p4" "title" "p4title" "dates" $dates "content" $contentMarkdownDefault "draft" $data.draft ) }}
@@ -329,6 +331,24 @@ func TestPagesFromGoTmplRemoveGoTmpl(t *testing.T) {
 	b.AssertFileContent("public/docs/index.html", "RegularPagesRecursive: pfile:/docs/pfile|$")
 }
 
+// Issue #13443.
+func TestPagesFromGoRelatedKeywords(t *testing.T) {
+	t.Parallel()
+	b := hugolib.Test(t, filesPagesFromDataTempleBasic)
+
+	p1 := b.H.Sites[0].RegularPages()[0]
+	icfg := related.IndexConfig{
+		Name: "keywords",
+	}
+	k, err := p1.RelatedKeywords(icfg)
+	b.Assert(err, qt.IsNil)
+	b.Assert(k, qt.DeepEquals, icfg.StringsToKeywords("foo", "Bar"))
+	icfg.Name = "title"
+	k, err = p1.RelatedKeywords(icfg)
+	b.Assert(err, qt.IsNil)
+	b.Assert(k, qt.DeepEquals, icfg.StringsToKeywords("p1:p1"))
+}
+
 func TestPagesFromGoTmplLanguagePerFile(t *testing.T) {
 	filesTemplate := `
 -- hugo.toml --