From https://once.com/writebook

app/models/user.rb

@@ -0,0 +1,36 @@
+class User < ApplicationRecord
+  include Role, Transferable
+
+  has_many :sessions, dependent: :destroy
+  has_secure_password validations: false
+
+  has_many :accesses, dependent: :destroy
+  has_many :books, through: :accesses
+  has_many :leaves, through: :books
+
+  after_create :grant_access_to_everyone_books
+
+  scope :active, -> { where(active: true) }
+  scope :ordered, -> { order(:name) }
+
+  def current?
+    self == Current.user
+  end
+
+  def deactivate
+    transaction do
+      sessions.delete_all
+      update! active: false, email_address: deactived_email_address
+    end
+  end
+
+  private
+    def deactived_email_address
+      email_address&.gsub(/@/, "-deactivated-#{SecureRandom.uuid}@")
+    end
+
+    def grant_access_to_everyone_books
+      all_accesses = Book.with_everyone_access.ids.collect { |id| { book_id: id, level: :reader } }
+      accesses.insert_all(all_accesses)
+    end
+end