open latter

1 Add Gem

2 gem "letter_opener", :group => :development

3 bundle install

4 config/environments/development.rb

config.action_mailer.delivery_method = :letter_opener

config.action_mailer.perform_deliveries = true

5 rails g mailer UserMailer

mailers/user_mailer.rb

class UserMailer < ApplicationMailer

  def example(user)

    @user = user

    mail(to: @user.email, subject: 'Test Email for Letter Opener')

  end

end

6 app/views/user_mailer/example.html.erb 

<h1>Welcome <%= @user.email %>! </h1>

7 users_controller.rb

def index

  UserMailer.example(User.new(email: 'bo@samurails.com')).deliver

  @users = User.all

end