Merge pull request #16949 from github/do-not-mutate-page-in-sitetree

Refactor how we get map topic content

lib/get-map-topic-content.js

@@ -1,22 +1,12 @@
-const findPage = require('./find-page')
+// get the childArticles set on map topics in lib/site-tree.js
+module.exports = function getMapTopicContent (parentProductId, breadcrumbs, siteTree) {
+  const childArticles = siteTree.products[parentProductId].categories[breadcrumbs.category.href].maptopics[breadcrumbs.maptopic.href].childArticles
 
-// get the page.childArticles set on english map topics in lib/site-tree.js
-module.exports = function getMapTopicContent (page, pageMap, redirects) {
-  const englishPage = page.languageCode !== 'en'
-    ? findPage(`/${page.relativePath.replace(/.md$/, '')}`, pageMap, redirects, 'en')
-    : page
-
-  if (!englishPage) {
-    console.error(`cannot find english page: ${page.fullPath}`)
-    return
+  if (!childArticles) {
+    console.error(`can't find child articles from siteTree for map topic '${breadcrumbs.maptopic.href}'`)
   }
 
-  if (!englishPage.childArticles) {
-    console.error(`error getting child articles on map topic: ${page.fullPath}`)
-    return
-  }
-
-  return englishPage.childArticles
+  return childArticles
     .map(article => `{% link_with_intro /${article.href} %}`)
     .join('\n\n')
 }

lib/page.js

@@ -148,7 +148,8 @@ class Page {
     this.shortTitle = await renderContent(this.shortTitle, context, { textOnly: true, encodeEntities: true })
 
     let markdown = this.mapTopic
-      ? getMapTopicContent(this, context.pages, context.redirects)
+      // get the map topic child articles from the siteTree
+      ? getMapTopicContent(this.parentProduct.id, context.breadcrumbs, context.siteTree[context.currentLanguage][context.currentVersion])
       : this.markdown
 
     // If the article is interactive parse the React!

lib/site-tree.js

@@ -125,16 +125,13 @@ function buildMaptopicsTree (tocItems, versionedCategoryHref, pageMap, redirects
       // if this is not a maptopic, return early
       if (!page.mapTopic) return
 
-      const childArticles = getChildArticles(tocItems, item.href)
-
       maptopic.title = page.title
       maptopic.shortTitle = page.shortTitle
       maptopic.hidden = page.hidden
-
       // make the child articles accessible to the page object for maptopic rendering
-      if (!page.childArticles) page.childArticles = childArticles
+      maptopic.childArticles = getChildArticles(tocItems, item.href)
+      maptopic.articles = buildArticlesTree(maptopic.childArticles, versionedCategoryHref, pageMap, redirects, version, languageCode)
 
-      maptopic.articles = buildArticlesTree(page.childArticles, versionedCategoryHref, pageMap, redirects, version, languageCode)
       maptopicTree[versionedMaptopicHref] = maptopic
     })