Add role to users

app/models/user.rb

@@ -1,4 +1,11 @@
 class User < ApplicationRecord
+  enum role: [:user, :moderator, :admin]
+  after_initialize :set_default_role, if: :new_record?
+
+  def set_default_role
+    self.role ||= :user
+  end
+
   devise :database_authenticatable, :registerable,
          :recoverable, :rememberable, :validatable,
          :confirmable