Add required configuration to development.rb and generate devise User

app/models/user.rb

@@ -1,4 +1,8 @@
 class User < ApplicationRecord
+  # Include default devise modules. Others available are:
+  # :confirmable, :lockable, :timeoutable, :trackable and :omniauthable
+  devise :database_authenticatable, :registerable,
+         :recoverable, :rememberable, :validatable
 
   has_many :categories, dependent: :destroy, foreign_key: :author_id
   has_many :payments, dependent: :destroy, foreign_key: :author_id

config/environments/development.rb

@@ -2,7 +2,7 @@
 
 Rails.application.configure do
   # Settings specified here will take precedence over those in config/application.rb.
-
+  config.action_mailer.default_url_options = { host: 'localhost', port: 3000 }
   # In the development environment your application's code is reloaded any time
   # it changes. This slows down response time but is perfect for development
   # since you don't have to restart the web server when you make code changes.

config/routes.rb

@@ -1,4 +1,5 @@
 Rails.application.routes.draw do
+  devise_for :users
   # Define your application routes per the DSL in https://guides.rubyonrails.org/routing.html
 
   # Reveal health status on /up that returns 200 if the app boots with no exceptions, otherwise 500.

db/migrate/20231206114648_add_devise_to_users.rb

@@ -0,0 +1,51 @@
+# frozen_string_literal: true
+
+class AddDeviseToUsers < ActiveRecord::Migration[7.1]
+  def self.up
+    change_table :users do |t|
+      ## Database authenticatable
+      t.string :email,              null: false, default: ""
+      t.string :encrypted_password, null: false, default: ""
+
+      ## Recoverable
+      t.string   :reset_password_token
+      t.datetime :reset_password_sent_at
+
+      ## Rememberable
+      t.datetime :remember_created_at
+
+      ## Trackable
+      # t.integer  :sign_in_count, default: 0, null: false
+      # t.datetime :current_sign_in_at
+      # t.datetime :last_sign_in_at
+      # t.string   :current_sign_in_ip
+      # t.string   :last_sign_in_ip
+
+      ## Confirmable
+      # t.string   :confirmation_token
+      # t.datetime :confirmed_at
+      # t.datetime :confirmation_sent_at
+      # t.string   :unconfirmed_email # Only if using reconfirmable
+
+      ## Lockable
+      # t.integer  :failed_attempts, default: 0, null: false # Only if lock strategy is :failed_attempts
+      # t.string   :unlock_token # Only if unlock strategy is :email or :both
+      # t.datetime :locked_at
+
+
+      # Uncomment below if timestamps were not included in your original model.
+      # t.timestamps null: false
+    end
+
+    add_index :users, :email,                unique: true
+    add_index :users, :reset_password_token, unique: true
+    # add_index :users, :confirmation_token,   unique: true
+    # add_index :users, :unlock_token,         unique: true
+  end
+
+  def self.down
+    # By default, we don't want to make any assumption about how to roll back a migration when your
+    # model already existed. Please edit below which fields you would like to remove in this migration.
+    raise ActiveRecord::IrreversibleMigration
+  end
+end