#2 ぼちぼち

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