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 rails g model Newsletter name:string email:string

  subl app/models/newsletter.rb

  validates :name, presence: true
  validates :email, presence: true

 rails g controller Newsletters create
  
  class NewslettersController < ApplicationController
    skip_before_action :authenticate_user!
    before_action :set_newsletter, only: [:destroy]

    def create
      @newsletter = Newsletter.create(newsletter_params)
      if @newsletter.save
        redirect_to blog_index_path
      else
        redirect_to root_path
      end
    end

    private

      def set_newsletter
        @newsletter = Newsletter.find(params[:id])
      end

      def newsletter_params
        params.require(:newsletter).permit(:name, :email)
      end

  end

subl app/config/routes.rb
    
  resources :newsletters

subl app/views/newsletters/_form.html.erb

  <%= form_for (Newsletter.new) do |f| %>
    <div class="col-md-12" style="margin: 0 auto; padding: 0;">
      <div class="col-md-6" style="padding: 0;">
        <%= f.text_field :name, class: 'form-control', placeholder:'Nombre' %>
      </div>
      <div class="col-md-6" style="padding: 0;">
        <%= f.text_field :email, class: 'form-control', placeholder:'Email' %>
      </div>
    </div>
    <div class="col-md-12" style="margin: 0 auto; padding:0;">
      <%= f.submit class:"col-md-12 tran3s s-color-bg hvr-shutter-out-horizontal", style:'border: none; color: white; cursor: pointer; margin: 0.5em auto; padding: 0.75em; width: 100%;' %>
    </div>
  <% end %>

subl app/views/layouts/_footer.html.erb

  <%= render 'newsletters/form' %>

Install the -letter_opener- to can preview email in the default browser instead of sending it. This means we do not need to set up email delivery in our development environment, and we are no longer need to worry about accidentally sending a test email to someone else's address.

Add the gem to our development environment and run the bundle command to install it.

subl your_project/Gemfile

  gem "letter_opener", :group => :development

 subl your_project/app/config/environments/development.rb

  config.action_mailer.delivery_method = :letter_opener

 rails generate mailer UserMailer newsletter_mailer

subl your_project/app/mailers/user_mailer.rb

class UserMailer 'your_gmail_account@gmail.com'

  
  def newsletter_mailer
    @newsletter = Newsletter.all
    @post = Post.last(3)
    emails = @newsletter.collect(&:email).join(", ")
    mail(to: emails, subject: "Hi, this is a test mail.")
  end
  
end

subl your_project/app/views/user_mailer/newsletter_mailer.html.erb

<p> Dear Followers: </p>
<p> Those are the lastest entries to our blog. We invite you to read and share everything we did on this week. </p>

<br/>
<table>
<% @post.each do |post| %>
  <%#= link_to blog_url(post) do %>
      <tr style="display:flex; float:left; clear:both;">
        <td style="display:flex; float:left; clear:both; height: 80px; width: 100px;">
          <% if post.cover_image.present? %>
            <%= image_tag post.cover_image.fullsize.url, class:"principal-home-image-slider" %>
          <%# else %>
            <%#= image_tag 'http://your_site_project.com' + post.cover_video, class:"principal-home-image-slider" %>
            <%#= raw(video_embed(post.cover_video)) %>
          <% end %>
        </td>
        <td>
          <h3>
            <%= link_to post.title, :controller => "blog", :action => "show", :only_path => false, :id => post.id %>
          </h3>
          <p><%= post.subtitle %></p>
        </td>
        <td style="display:flex; float:left; clear:both;">
           
        </td>
      </tr>
  <%# end %>
<% end %>
</table>

Since we want to send the email as a separate process

touch lib/taks/email_tasks.rake

desc 'weekly newsletter email'
task weekly_newsletter_email: :environment do
  UserMailer.newsletter_mailer.deliver!
end

 rake weekly_newsletter_email

subl your_project/Gemfile
  
  gem 'whenever', require: false

wheneverize .

  [add] writing `./config/schedule.rb'
  [done] wheneverized!

Inside the schedule file, we have to create our CRON JOB and call the mailer method inside determining the CRON JOB to operate some tasks without assistance and in a selected range of time.

subl your_project/config/schedule.rb

every 1.day, :at => '4:30 am' do
  rake 'weekly_newsletter_email'
end

your_project your_mac_user$ whenever

30 4 * * * /bin/bash -l -c 'cd /Users/your_mac_user/Desktop/your_project && RAILS_ENV=production bundle exec rake weekly_newsletter_email --silent'

To run the test in Development Environment, is wise to set the next line on the application.rb principal file to let the application knows where are the models it will use.

subl your_project/config/application.rb

  config.action_mailer.default_url_options = { :host => "http://localhost:3000/" }

Let Capistrano V3 save the new Cron Job inside the server and the trigger which will fired up the execution of this task, we have to add the next requirement:

  subl your_project/Capfile

  require 'whenever/capistrano'

Insert into the deploy file the identifier which CRON JOB will use about the environment and the name of the application.

subl your_project/config/deploy.rb

set :whenever_identifier, ->{ "#{fetch(:application)}_#{fetch(:rails_env)}" }

Ready, after save changes on each file, run the capistrano deploy command given below:

cap production deploy

Now our JOB was created and calendarize to run the Mailer Method which is what i want and in the range of time we set on this files.