#442

backend/app/controllers/post_versions_controller.rb

@@ -15,6 +15,7 @@ class PostVersionsController < ApplicationController
     offset = (page - 1) * limit
 
     q = HistoryAccess.visible(PostVersion.all)
+    q = q.with_previous_version if tag_id || external_tag_id
     q = q.where('post_versions.post_id = ?', post_id) if post_id
     q = q.with_previous_version if tag_id || external_tag_id
     if external_tag_id || (tag_id && !(Tag.exists?(id: tag_id)))

backend/app/controllers/posts_controller.rb

@@ -37,15 +37,7 @@ class PostsController < ApplicationController
 
     offset = (page - 1) * limit
 
-    pt_max_sql =
-        HistoryAccess.visible(PostVersion.all)
-        .where('post_versions.post_id = posts.id')
-        .select('MAX(post_versions.created_at)')
-        .to_sql
-
-    updated_at_all_sql =
-        'GREATEST(posts.updated_at,' +
-        "COALESCE((#{ pt_max_sql }), posts.updated_at))"
+    updated_at_all_sql = 'posts.updated_at'
 
     q =
         filtered_posts(locale)
@@ -93,8 +85,7 @@ class PostsController < ApplicationController
 
     render json: { posts: posts.map { |post|
       PostRepr.base(post, language_code: locale.language_code)
-              .merge(updated_at: [post.updated_at, latest_version_times[post.id]].compact.max)
-              .tap do |json|
+              .merge(updated_at: post.updated_at).tap do |json|
         json['thumbnail'] =
             if post.thumbnail.attached?
               rails_storage_proxy_url(post.thumbnail, only_path: false)

backend/app/models/history_access.rb

@@ -114,7 +114,7 @@ class HistoryAccess < ActiveSupport::CurrentAttributes
       private_names = 'SELECT DISTINCT private_name.name, ' +
           'CAST(private_name.name AS BINARY) AS name_bytes FROM tag_versions private_tag ' +
           "JOIN (#{ discarded_keys('tag_versions', 'tag_id') }) blocked " +
-          "ON blocked.tag_id = private_tag.tag_id " +
+          'ON blocked.tag_id = private_tag.tag_id ' +
           "JOIN JSON_TABLE(#{ names }, '$[*]' COLUMNS (name TEXT PATH '$')) private_name " +
           "WHERE private_name.name <> ''"
       ["NOT EXISTS (SELECT 1 FROM (#{ private_names }) private_name WHERE " +