btrc-hub/backend/app/models/user.rb

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] }

  has_many :posts
  has_many :settings
  has_many :ip_addresses
  has_many :user_ips, dependent: :destroy
  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', foreign_key: 'created_user_id', 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
  end
end