Preview Devise Mails

preview_devise_mail.rb

# config/enviroments/development.rb
config.action_mailer.preview_path = "#{Rails.root}/app/mailer_previews"


# app/mailer_previews/devise_mailer_preview.rb
class Devise::MailerPreview < ActionMailer::Preview
  def confirmation_instructions
    Devise::Mailer.confirmation_instructions(User.first, {})
  end

  def unlock_instructions
    Devise::Mailer.unlock_instructions(User.first, "faketoken")
  end

  def reset_password_instructions
    Devise::Mailer.reset_password_instructions(User.first, "faketoken")
  end
end

The default path for RSpec users: spec/mailers/previews/devise_mailer_preview.rb

Rails will expect DeviseMailerPreview instead of Devise::MailerPreview as the class name in app/mailer_previews/devise_mailer_preview.rb 👍

Seems to work with Devise module or Devise added to class name.

Thanks @ThawanFidelis