#351

backend/app/controllers/posts_controller.rb

@@ -392,7 +392,7 @@ class PostsController < ApplicationController
       tag = tags_by_id[tag_id]
       return nil unless tag
 
-      sections = PostTagSection.where(post_id: post.id, tag_id: tag.id)
+      sections = PostTagSection.where(post_id: post.id, tag_id:)
                  .as_json(only: [:begin_ms, :end_ms])
 
       if path.include?(tag_id)
@@ -419,7 +419,7 @@ class PostsController < ApplicationController
 
     params[:parent_post_ids].to_s.split.map { |token|
       id = Integer(token, exception: false)
-      raise ArgumentError, "親投稿 Id. が不正です: #{ token }" if id.nil? || id <= 0
+      raise ArgumentError, "親投稿 Id. が不正です: #{ token }" if !(id) || id <= 0
 
       id
     }.uniq

backend/app/models/tag.rb

@@ -102,7 +102,7 @@ class Tag < ApplicationRecord
     tags = tag_names.map do |name|
       pf, cat = CATEGORY_PREFIXES.find { |p, _| name.downcase.start_with?(p) } || ['', nil]
 
-      name = TagName.canonicalise(name.sub(/\A#{ pf }/i, '')).first
+      name = name.sub(/\A#{ pf }/i, '')
 
       sections_by_tag = []
       while n = name.sub!(/^(\S*?)\[([0-9:.]*?)-([0-9:.]*?)\](\S*?)$/, '\1\4 \2 \3')
@@ -116,9 +116,14 @@ class Tag < ApplicationRecord
         sections_by_tag << [begin_ms, end_ms]
       end
 
+      name = TagName.canonicalise(name).first
+
       find_or_create_by_tag_name!(name, category: (cat || :general)).tap do |tag|
         tag.update!(category: cat) if cat && tag.category != cat
-        sections[tag.id] = sections_by_tag if sections_by_tag.present?
+        next if sections_by_tag.blank?
+
+        sections[tag.id] ||= []
+        sections[tag.id].concat(sections_by_tag)
       end
     end