#2 ぼちぼち

backend/app/models/ip_address.rb

@@ -0,0 +1,6 @@
+class IpAddress < ApplicationRecord
+  validates :ip_address, presence: true, length: { maximum: 16 }
+  validates :banned, inclusion: { in: [true, false] }
+
+  has_many :users
+end

backend/app/models/nico_tag_relation.rb

@@ -0,0 +1,17 @@
+class NicoTagRelation < ApplicationRecord
+  belongs_to :nico_tag, class_name: 'Tag', foreign_key: 'nico_tag_id'
+  belongs_to :tag, class_name: 'Tag', foreign_key: 'tag_id'
+
+  validates :nico_tag_id, presence: true
+  validates :tag_id, prosence: true
+
+  validate :nico_tag_must_be_nico
+
+  private
+
+  def nico_tag_must_be_nico
+    if nico_tag && nico_tag.category != :nico
+      errors.add :nico_tag_id, 'タグのカテゴリがニコニコである必要があります．'
+    end
+  end
+end

backend/app/models/post.rb

@@ -1,2 +1,4 @@
 class Post < ApplicationRecord
+  belongs_to :parent, class_name: 'Post', optional: true, foreign_key: 'parent_id'
+  belongs_to :user, foreign_key: ''
 end

backend/app/models/tag.rb

@@ -0,0 +1,14 @@
+class Tag < ApplicationRecord
+  validates :name, presence: true, length: { maximum: 255 }
+  validates :category, presence: true, inclusion: { in: categories.keys }
+
+  enum category: { deerjikist:  'deerjikist',
+                   meme:        'meme',
+                   character:   'character',
+                   general:     'general',
+                   material:    'material',
+                   nico:        'nico',
+                   meta:        'meta' }
+
+  scope :nico_tags, -> { where(category: :nico) }
+end

backend/app/models/user.rb

@@ -0,0 +1,12 @@
+class User < ApplicationRecord
+  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
+end