From b5b5391c8e455e283d75ababf44b91919a334219 Mon Sep 17 00:00:00 2001
From: miteruzo <miteruzo@naver.com>
Date: Wed, 5 Aug 2026 12:43:33 +0900
Subject: [PATCH] #354

---
 .../app/controllers/application_controller.rb |  7 ++++
 .../controllers/post_versions_controller.rb   | 39 ++++++-------------
 backend/app/controllers/posts_controller.rb   |  4 +-
 backend/app/models/post.rb                    | 25 +++++++++---
 4 files changed, 39 insertions(+), 36 deletions(-)

diff --git a/backend/app/controllers/application_controller.rb b/backend/app/controllers/application_controller.rb
index 42adc75..95ec17a 100644
--- a/backend/app/controllers/application_controller.rb
+++ b/backend/app/controllers/application_controller.rb
@@ -85,4 +85,11 @@ class ApplicationController < ActionController::API
                    base_errors: },
            status:
   end
+
+  def normalise_json value
+    return nil if value.nil?
+    return JSON.parse(value) if value.is_a?(String)
+
+    value
+  end
 end
diff --git a/backend/app/controllers/post_versions_controller.rb b/backend/app/controllers/post_versions_controller.rb
index a04abf2..0c6f632 100644
--- a/backend/app/controllers/post_versions_controller.rb
+++ b/backend/app/controllers/post_versions_controller.rb
@@ -1,7 +1,7 @@
 class PostVersionsController < ApplicationController
   def index
     post_id = params[:post].presence
-    tag_id = params[:tag].presence
+    tag_id = params[:tag].presence&.to_i
     page = (params[:page].presence || 1).to_i
     limit = (params[:limit].presence || 20).to_i
 
@@ -10,12 +10,6 @@ class PostVersionsController < ApplicationController
 
     offset = (page - 1) * limit
 
-    tag_name =
-        if tag_id
-          TagName.joins(:tag).find_by(tag: { id: tag_id })
-        end
-    return render json: { versions: [], count: 0 } if tag_id && tag_name.blank?
-
     q = PostVersion.joins(<<~SQL.squish)
           LEFT JOIN
             post_versions prev
@@ -32,10 +26,10 @@ class PostVersionsController < ApplicationController
                 'prev.original_created_from AS prev_original_created_from',
                 'prev.original_created_before AS prev_original_created_before')
     q = q.where('post_versions.post_id = ?', post_id) if post_id
-    if tag_name
-      escaped = ActiveRecord::Base.sanitize_sql_like(tag_name.name)
-      q = q.where(("JSON_CONTAINTS(post_version.tags_json, JSON_OBJECT('id', :tag_id)) " +
-                   "OR JSON_CONTAINS(prev.tags_json, JSON_OBJECT('id', :tag_id))"), tag_id:)
+    if tag_id
+      q = q.where(("JSON_CONTAINS(post_versions.tags_json, JSON_OBJECT('id', :tag_id)) " +
+                   "OR JSON_CONTAINS(prev.tags_json, JSON_OBJECT('id', :tag_id))"),
+                  tag_id:)
     end
 
     count = q.except(:select, :order, :limit, :offset).count
@@ -49,24 +43,17 @@ class PostVersionsController < ApplicationController
 
   private
 
-  def tag_literal tag
-    sections = tag.fetch('sections', []).map do |sec|
-      begin_ms = sec.fetch('begin_ms')
-      end_ms = sec['end_ms']
-
-      "[#{ Post.ms_to_time(begin_ms) }-#{ end_ms ? Post.ms_to_time(end_ms) : '' }]"
-    end
-
-    "#{ tag.fetch('name') }#{ sections.join }"
-  end
-
   def serialise_versions rows
     user_ids = rows.map(&:created_by_user_id).compact.uniq
     users_by_id = User.where(id: user_ids).pluck(:id, :name).to_h
 
     rows.map do |row|
-      cur_tags = split_tags(row.tags_json.map { tag_literal(_1) })
-      prev_tags = split_tags(row.attributes['prev_tags_json'].map { tag_literal(_1) })
+      cur_tags =
+          Array(normalise_json(row.tags_json))
+          .map { Post.tag_snapshot_literal(_1) }
+      prev_tags =
+          Array(normalise_json(row.attributes['prev_tags_json']))
+          .map { Post.tag_snapshot_literal(_1) }
 
       { post_id: row.post_id,
         version_no: row.version_no,
@@ -110,8 +97,4 @@ class PostVersionsController < ApplicationController
       }
     end
   end
-
-  def split_tags(tags)
-    tags.to_s.split(/\s+/).reject(&:blank?)
-  end
 end
diff --git a/backend/app/controllers/posts_controller.rb b/backend/app/controllers/posts_controller.rb
index eec228b..3f5a92c 100644
--- a/backend/app/controllers/posts_controller.rb
+++ b/backend/app/controllers/posts_controller.rb
@@ -700,8 +700,8 @@ class PostsController < ApplicationController
 
   def editable_tag_names_from_version version
     version.tags_json
-        .reject { _1[:name].downcase.start_with?('nico:') }
-        .map { tag_literal(_1) }
+        .reject { _1.fetch('category') == 'nico' }
+        .map { Post.tag_snapshot_literal(_1) }
         .sort
   end
 
diff --git a/backend/app/models/post.rb b/backend/app/models/post.rb
index cde0929..08f8fec 100644
--- a/backend/app/models/post.rb
+++ b/backend/app/models/post.rb
@@ -137,18 +137,31 @@ class Post < ApplicationRecord
     end
   end
 
+  def self.tag_snapshot_literal tag
+    sections = tag.fetch('sections', []).map do |sec|
+      begin_ms = sec.fetch('begin_ms')
+      end_ms = sec['end_ms']
+
+      "[#{ Post.ms_to_time(begin_ms) }-#{ end_ms ? Post.ms_to_time(end_ms) : '' }]"
+    end
+
+    "#{ tag.fetch('name') }#{ sections.join }"
+  end
+
   def snapshot_tags_json
     post_tags
         .kept
         .joins(tag: :tag_name)
         .includes(:sections, tag: :tag_name)
-        .order('tag_names.name')
+        .order('tags.id')
         .map do |pt|
-      { id: pt.tag.id,
-        version_no: pt.tag.version_no,
-        name: pt.tag.name,
-        category: pt.tag.category,
-        sections: pt.sections.map { { begin_ms: _1.begin_ms, end_ms: _1.end_ms } } }
+      { 'id' => pt.tag.id,
+        'version_no' => pt.tag.version_no,
+        'name' => pt.tag.name,
+        'category' => pt.tag.category,
+        'sections' => pt.sections.sort_by(&:begin_ms).map {
+          { 'begin_ms' => _1.begin_ms, 'end_ms' => _1.end_ms }
+        } }
     end
   end