set up rails

app/models/user.rb

@@ -0,0 +1,9 @@
+class User < ApplicationRecord
+    # Include default devise modules. Others available are:
+    # :confirmable, :lockable, :timeoutable, :trackable and :omniauthable
+    devise :database_authenticatable, :registerable,
+         :recoverable, :rememberable, :validatable,
+         :trackable, :confirmable
+
+    has_many :authorized_applications, dependent: :destroy
+end