I have a mailer that I can see in my log is getting sent, but the email body does not contain anything from the mailer view.
It's due to the fact that I've put things in subfolders and i've tried using :template_path in my mail function but to no avail.
app/mailers/marketing/marketing_mailer.rb
class Marketing::MarketingMailer < ActionMailer::Base
    require 'mail'
    address = Mail::Address.new "[email protected]" # ex: "[email protected]"
    address.display_name = "Text" # ex: "John Doe"
    # Set the From or Reply-To header to the following:
    address.format # returns "John Doe <[email protected]>"
    default from: address
    # Sends an email when someone fills out the contact form
    def contact(name, email, message)
        @name = name
        @email = email
        @message = message
        mail(:subject => "Test", :to => '[email protected]', :reply_to => @email) # <== I've tried using :template_path => 'marketing', 'marketing/marketing_mailer', etc, but none worked.
    end
end
/app/views/marketing/marketing_mailer/contact.html.erb
<!DOCTYPE html>
<html>
  <head>
    <meta content="text/html; charset=UTF-8" http-equiv="Content-Type" />
  </head>
  <body>
    <p>Name: <%= @name %></p>
    <p>Email: <%= @email %></p>
    <p>Message: <%= @message %></p>
  </body>
</html>
I noticed that devise has mailer views inside /views/devise/mailers/... so I know it's possible, but i'm not sure how.
Have you tried mail with {:template_path => 'marketing/marketing_mailer, :template_name =>'contact'} ?
The template name probably expects the namespace in the filename somehow
Does it work without the template Rendering
   class Marketing::MarketingMailer < ActionMailer::Base
   def welcome_email(user, email_body)
     mail(to: user.email,
     body: email_body,
     content_type: "text/html",
     subject: "Already rendered!")
   end
   end
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