feat: 投稿にニコタグ追加できてしまふバグ修正（#125） (#236)

#125

#125

Co-authored-by: miteruzo <miteruzo@naver.com>
Reviewed-on: #236

backend/app/models/tag.rb

@@ -1,4 +1,8 @@
 class Tag < ApplicationRecord
+  class NicoTagNormalisationError < ArgumentError
+    ;
+  end
+
   has_many :post_tags, dependent: :delete_all, inverse_of: :tag
   has_many :active_post_tags, -> { kept }, class_name: 'PostTag', inverse_of: :tag
   has_many :post_tags_with_discarded, -> { with_discarded }, class_name: 'PostTag'
@@ -63,10 +67,14 @@ class Tag < ApplicationRecord
     @bot ||= find_or_create_by_tag_name!('bot操作', category: 'meta')
   end
 
-  def self.normalise_tags tag_names, with_tagme: true
+  def self.normalise_tags tag_names, with_tagme: true, deny_nico: true
+    if deny_nico && tag_names.any? { |n| n.start_with?('nico:') }
+      raise NicoTagNormalisationError 
+    end
+
     tags = tag_names.map do |name|
       pf, cat = CATEGORY_PREFIXES.find { |p, _| name.start_with?(p) } || ['', nil]
-      name.delete_prefix!(pf)
+      name = name.delete_prefix(pf)
       find_or_create_by_tag_name!(name, category: (cat || 'general')).tap do |tag|
         if cat && tag.category != cat
           tag.update!(category: cat)
@@ -101,11 +109,13 @@ class Tag < ApplicationRecord
     (result + tags).uniq { |t| t.id }
   end
 
-  def self.find_or_create_by_tag_name!(name, category:)
+  def self.find_or_create_by_tag_name! name, category:
     tn = TagName.find_or_create_by!(name: name.to_s.strip)
     Tag.find_or_create_by!(tag_name_id: tn.id) do |t|
       t.category = category
     end
+  rescue ActiveRecord::RecordNotUnique
+    retry
   end
 
   private