letter_bomb

Emails are pretty dangerous - inspect your mailer templates from the safety of your browser.

Add to your Gemfile:

gem "letter_bomb", group: :development

and bundle away.

Mount the engine in your routes.rb:

if Rails.env.development?
  mount LetterBomb::Engine, at: "/letter_bomb"
end

and hit /letter_bomb for a list of previews.

Previews can be defined anywhere within app/mailers suffixed with preview, i.e. app/mailers/user_mailer_preview.rb. Preview method names are arbitrary so long as they return a Mail object.

class UserMailerPreview < LetterBomb::Preview
  def welcome
    WelcomeMailer.for_user(User.last)
  end
end

Preview methods are wrapped in an ActiveRecord transaction block that will be rolled back after execution, so it's safe to create your own test data within them.

• ags
• andrewk
• lsimoneau

Rails 4 introduced ActionMailer::Preview, which should be preferred if available.