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Ankit Pariyar
Ankit Pariyar

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Using Devise and SendGrid to send confirmation email on rails app

First make normal rails app with devise user model

  • $ rails new awesome-app This will create new app

  • $ cd awesome-app It will change the directory to our new project

Setup Gemfile

  • Add gem 'devise' and gem 'sendgrid-ruby' to the Gemfile

  • finally run $ bundle install on terminal

Setup devise

  • $ rails generate devise:install it will create config/initializers/devise.rb and config/locales/devise.en.yml file and follow the instruction generated by above command

  • Now generate devise user model with $ rails generate devise User

  • then go to app/models/user.rb and make this file look like this:

    class User < ApplicationRecord
     # Include default devise modules. Others available are:
     # :confirmable, :lockable, :timeoutable, :trackable and :omniauthable
     devise :database_authenticatable, :registerable,
            :recoverable, :rememberable, :validatable, :confirmable
  • Uncomment the Confirmable section of migration file located on the app/db/migrate

    class DeviseCreateUsers < ActiveRecord::Migration[7.0]
      def change
        create_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
          t.timestamps null: false
        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
  • Then run $ rails db:migrate

Set up SendGrid

  • Create account on SendGrid
  • Set up a sender identity on SendGrid by clicking this link:

  • Create your API key by following this link:

  • add gem 'dotenv-rails' on development and test group on gem file and run $ bundle install

  • create .env file in your project root and add following line inside it SENDGRID_API_KEY = 'YOUR API KEY'

  • Then, modify this Devise config to use your SendGrid sender identity:

# config/initializers/devise.rb
config.mailer_sender = ''
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Set up Action Mailer

  • create config/initializers/action_mailer.rb file and add following code
 # config/initializers/action_mailer.rb
ActionMailer::Base.smtp_settings = {
    user_name: "apikey",
    password: ENV['SENDGRID_API_KEY'],
    domain: "",
    address: "",
    port: 587,
    authentication: :plain,
    enable_starttls_auto: true
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Now let Test it

Image of sign up form

  • After signing up we will get the confirmation email.

Image of confirmation email

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