Previewing Emails in Rails Applications With the Mail_View Gem

Sep 27, 2019


Welcome to Your SEO Geek, the leading SEO company in Buffalo. In this technical article, we will explore how to preview emails in Rails applications using the Mail_View gem. Our goal is to provide comprehensive information to aspiring developers who want to enhance their email functionality in Rails.

Why Previewing Emails is Important

Before diving into the details, let's understand why previewing emails in Rails applications is crucial. As a business owner or developer, you want to ensure that your emails are visually appealing, error-free, and display correctly across different devices and email clients. Previewing emails allows you to identify and fix any issues before sending them to your users, ensuring a seamless and professional communication experience.

The Mail_View Gem

The Mail_View gem is a powerful tool that simplifies the process of previewing emails in Rails applications. By leveraging the gem's functionality, you can easily preview your email templates without the need to send actual emails. This helps streamline the development and testing process, saving both time and effort.


Before diving into the installation process, make sure you have Rails installed on your machine. To add the Mail_View gem to your project, simply include it in your Gemfile:

gem 'mail_view'

Once you've added the gem, run the bundle install command from your terminal to install it:

$ bundle install

Great! You now have the Mail_View gem successfully installed in your Rails application.

Setting Up Email Previews

To start previewing your emails, you need to set up the necessary configuration and define your email previews. Follow these steps:

  1. Create a new file called mail_view.rb in the config/initializers directory.
  2. Open the mail_view.rb file and add the following code to configure the Mail_View gem:
if Rails.env.development? require 'mail_view' MailView.setup do |config| config.preview_emails = true end end

These configuration settings enable email previews in the development environment.

Creating Email Previews

Now that the Mail_View gem is set up, you can start creating email previews. Here's how:

  1. Create a new directory called previews in the app/views directory if it doesn't exist already.
  2. Inside the previews directory, create a new file with the name of the email you want to preview, for example, user_mailer_preview.rb.
  3. In the user_mailer_preview.rb file, define a class that inherits from ActionMailer::Preview. This class will contain methods representing the different email templates you want to preview.
class UserMailerPreview < ActionMailer::Preview def welcome_email_preview UserMailer.welcome_email(User.first) end end

In this example, we define a method called welcome_email_preview that previews the welcome email template. You can define multiple methods to preview other email templates.

Ensure that the method names end with _preview, as this is the convention used by the Mail_View gem.

Previewing Emails

Now that you have set up your email previews, it's time to start previewing them. Follow these steps:

  1. Start your Rails server in the development environment.
  2. Visit the /rails/mailers URL in your browser.
  3. You will see a list of available email previews. Click on any preview to see a rendered version of the associated template.

By previewing your emails, you can ensure that they look exactly as intended before sending them to your users.

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Anna Burke
Great article! Looking forward to giving it a try and improving my email functionality! 💪💻
Nov 11, 2023
Jose Camargo
Interesting read! 💻📨 Can't wait to try it out myself!
Oct 6, 2023
Chloe Olson
The Mail_View gem seems like a game-changer. I'll definitely give it a try.
Sep 27, 2023
Matthieu Fortin
I love the practical examples you've included. They really help in understanding the concepts better.
May 22, 2023
Deirdre Pifer
I'm impressed by the depth of your knowledge. Keep up the great work!
Sep 15, 2022
Rich Munro
Very practical and well-written. You've made the process of previewing Rails emails clear.
Aug 11, 2022
You've simplified a complex topic and made it accessible for everyone. Much appreciated.
Jul 2, 2022
Marie Ortega
I love how you explain each step thoroughly. It's easy to follow.
Mar 14, 2022
Dipti Patel
This guide is going to save me so much time. Thank you!
Feb 25, 2022
Patrick Sauter
The email previewing process seemed daunting, but your explanation has made it seem manageable.
Feb 19, 2022
Peter Avildsen
I never knew previewing emails could be this straightforward. Thanks for shedding light on it.
Oct 29, 2021
Supervision Merida
I've been struggling with previewing emails in my Rails app. This article was precisely what I needed.
Jun 11, 2021
Kristy Mentro
As a fellow developer, I found this to be an insightful read. Kudos to you!
Apr 9, 2021
Monakay Reeves
I appreciate the detailed explanation. Thank you for sharing your insights.
Apr 1, 2021
Aaron Kipfmiller
Your expertise shines through in this article. It's evident that you know your stuff.
Feb 20, 2021
Les Frey
Great article! Very informative and helpful for Rails developers.
Apr 21, 2020
Emily Neville
I'm glad I stumbled upon this article. It's exactly what I was looking for.
Jan 16, 2020