#2 修正

backend/app/models/tag.rb

@@ -4,10 +4,7 @@ class Tag < ApplicationRecord
   has_many :tag_aliases, dependent: :destroy
   has_many :wiki_pages, dependent: :nullify
 
-  validates :name, presence: true, length: { maximum: 255 }
+  enum :category, { deerjikist:  'deerjikist',
-  validates :category, presence: true, inclusion: { in: categories.keys }
-
-  enum category: { deerjikist:  'deerjikist',
                     meme:        'meme',
                     character:   'character',
                     general:     'general',
@@ -15,5 +12,8 @@ class Tag < ApplicationRecord
                     nico:        'nico',
                     meta:        'meta' }
 
+  validates :name, presence: true, length: { maximum: 255 }
+  validates :category, presence: true, inclusion: { in: Tag.categories.keys }
+
   scope :nico_tags, -> { where category: :nico }
 end

backend/app/models/user.rb

@@ -1,11 +1,11 @@
 class User < ApplicationRecord
+  enum :role, { guest: 'guest', member: 'member', admin: 'admin' }
+
   validates :name, length: { maximum: 255 }
   validates :inheritance_code, presence: true, length: { maximum: 64 }
   validates :role, presence: true, inclusion: { in: roles.keys }
   validates :banned, inclusion: { in: [true, false] }
 
-  enum role: { guest: 'guest', member: 'member', admin: 'admin' }
-
   has_many :posts
   has_many :settings
   has_many :ip_addresses
@@ -13,12 +13,8 @@ class User < ApplicationRecord
   has_many :ip_addresses, through: :user_ips
   has_many :user_post_views, dependent: :destroy
   has_many :viewed_posts, through: :user_post_views, source: :post
-  has_many :created_wiki_pages, { class_name: 'WikiPage',
+  has_many :created_wiki_pages, class_name: 'WikiPage', foreign_key: 'created_user_id', dependent: :nullify
-                                  foreign_key: 'created_user_id',
+  has_many :updated_wiki_pages, class_name: 'WikiPage', foreign_key: 'updated_user_id', dependent: :nullify
-                                  dependent: :nullify }
-  has_many :updated_wiki_pages, { class_name: 'WikiPage',
-                                  foreign_key: 'updated_user_id',
-                                  dependent: :nullify }
 
   def viewed? post
     user_post_views.exists? post_id: post.id, viewed: true