Rails Devise mailer does not work with mjml about mjml-rails

[voordev]

Above suggestions resolved the issues. Thank you.

[sighmon]

@voordev I don't use a layout file, but here's what works for me:

# app/mailers/devise_mailer.rb
class DeviseMailer < Devise::Mailer
  def reset_password_instructions(record, token, opts={})
    # Logic to send the email with MJML
    @token = token
    @resource = record
    mail(
      :template_path => 'devise/mailer',
      :from => ENV["DEVISE_EMAIL_ADDRESS"], 
      :to => record.email, 
      :subject => "Reset password"
    ) do |format|
      format.mjml
      format.text
    end
  end
end

# app/views/devise/reset_password_instructions.mjml
<mjml>
  <mj-head>
    <mj-preview>Reset your password request</mj-preview>
  </mj-head>
  <mj-body>
    <mj-section>
      <mj-column>
        <mj-text>
          <p>Hello <%= @resource.email %>!</p>
        </mj-text>
      </mj-column>
    </mj-section>
  </mj-body>
</mjml>

# app/views/devise/reset_password_instructions.text.erb
Hello <%= @resource.email %>,
...