[CM2] Link posts in category not collection

It doesn't make sense to see a different category's post as the next or previous post link.
Also collections handle linking default category's posts

Author: scriptype

src/compiler/contentModel2/models/collection/category.js

@@ -18,6 +18,22 @@ function parseContent(node, content) {
 function category(node, context) {
   const settings = Settings.getSettings()
 
+  function linkPosts(post, postIndex, posts) {
+    post.links = {}
+    if (postIndex > 0) {
+      post.links.nextPost = {
+        title: posts[postIndex - 1].title,
+        permalink: posts[postIndex - 1].permalink
+      }
+    }
+    if (postIndex < posts.length - 1) {
+      post.links.previousPost = {
+        title: posts[postIndex + 1].title,
+        permalink: posts[postIndex + 1].permalink
+      }
+    }
+  }
+
   if (node.isDefaultCategory) {
     return {
       context,
@@ -94,6 +110,7 @@ function category(node, context) {
   })
 
   tree.posts.sort((a, b) => b.date - a.date)
+  tree.posts.forEach(linkPosts)
 
   const contentRaw = indexProps.content || ''
   const content = indexFile ?

src/compiler/contentModel2/models/collection/index.js

@@ -35,7 +35,7 @@ function collection(node) {
     })
   }
 
-  function attachLinks(post, postIndex, posts) {
+  function linkPosts(post, postIndex, posts) {
     post.links = {}
     if (postIndex > 0) {
       post.links.nextPost = {
@@ -62,6 +62,7 @@ function collection(node) {
       category: _.omit(defaultCategory, ['posts', 'context', 'content', 'attachments'])
     })
     defaultCategory.posts.push(uncategorizedPost)
+    defaultCategory.posts.forEach(linkPosts)
     tree.posts.push(uncategorizedPost)
   }
 
@@ -113,7 +114,6 @@ function collection(node) {
   tree.posts.sort((a, b) => b.date - a.date)
   tree.posts.forEach((post, i, posts) => {
     collectPostTags(post)
-    attachLinks(post, i, posts)
   })
 
   const contentRaw = indexProps.content || ''