Version 4.2.0 breaks email rendering

[pbougie]

My setup includes email templates, partials, and layouts. Using version 4.1.0, everything renders beautifully. Update to version 4.2.0 (or 4.2.1) and all the files are loading correctly but the MJML does not render into HTML.

I've tried renaming the files as described in the new README but it doesn't help. Tried different variations but nothing worked. Either the template is not found or the MJML does not render.

Working setup in version 4.1.0:

# Gemfile
gem 'mjml-rails', '4.1.0'

# mailers/test_mailer.rb
class TestMailer < ApplicationMailer
  layout 'test'

  def confirmation
    mail(to: 'test@example.com', from: 'hello@example.com') do |format|
      format.mjml
    end
  end
end

# Template + Layout:
# views/layouts/test.mjml
# views/test_mailer/confirmation.mjml.erb

Non-working setup in version 4.2.1

# Gemfile
gem 'mjml-rails', '4.2.1'

# mailers/test_mailer.rb
class TestMailer < ApplicationMailer
  layout 'test'

  def confirmation
    mail(to: 'test@example.com', from: 'hello@example.com') do |format|
      format.html
    end
  end
end

# Template + Layout:
# views/layouts/test.html.mjml
# views/test_mailer/confirmation.html.erb

No errors are thrown but the MJML is not converted into HTML. The log shows all templates and layouts are found and rendered.

[sighmon]

I'm afk, but you definitely don't have any mj-container tags in your MJML files?

[pbougie]

No, I don't have any mj-container tags in my MJML files.

[sighmon]

@pbougie in the new tests, @aleksandrs-ledovskis includes this line:

self.view_paths = File.expand_path("../views", __FILE__)

Does that help your missing templates issue?

Could you write a new test using your layout names and structure that fails?

[pbougie]

I don't have a missing templates issue. In the example above, the templates are found but the MJML is not rendered. I end up with little formatting and a bunch of CSS with my text. If I inspect the code, I see a bunch of mj-* tags.

[sighmon]

@pbougie Re: #34 do you have the <mjml> root tag outside of your layout file?

[pbougie]

No, the <mjml> tag is in my layout file.

[sighmon]

@pbougie and if you create a simple non-layout based template, does it render okay?

[pbougie]

I removed the layout and partials, and unfortunately I'm getting the same result.

[pbougie]

I've created a test project that you can fork: https://github.com/pbougie/mjml-rails-issue-36

[sighmon]

@pbougie Awesome thanks. It's the owa="desktop" in your <mjml> tag that's breaking things.

The bug was introduced here:
dba6419#diff-694a2aceb95a532b862cfae14a75287f

Would you like to propose a fix and submit a pull request? I wonder whether this regex is too broad? if compiled_source =~ /<mjml(.*)>/

[pbougie]

@sighmon I thought I had tried removing that attribute when I was trying various scenarios. Guess not. I've created a pull request: #38

[sighmon]

@pbougie Brilliant, thank you for persisting! I've merged that in now and pushed a new version.

[pbougie]

@sighmon Thanks!