This is a known bug in Haml 3.1, caused by nesting content within comments.
A fix should be forthcoming soon.

On Tue, May 10, 2011 at 5:28 AM, chadoh <chad.ostrow...@gmail.com> wrote:

> *Background info:*
> I am working my way through Crafting 
> Rails<http://pragprog.com/titles/jvrails/crafting-rails-applications> and
> in Chapter 4 I made a handler for "merb" templates—markdown with erb
> interspersed. This can be compiled into text or html, so it's perfect for
> mail. My "new_submission" Notification email has one template in
> app/views/notifications/new_submission.merb. Then in
> app/mailers/notifications.rb, all you need to do is
>
>     mail(:to => Person.editor.email) do |format|
>       format.text
>       format.html
>     end
>
> And the single .merb template gets compiled into both the text and html
> part of a multipart email. Woohoo! You can read more about this in an
> excerpt from Crafting 
> Rails<http://media.pragprog.com/titles/jvrails/emails.pdf>,
> and you can browse around my specific implementation of 
> it<https://github.com/chadoh/handlers>
> .
>
> *Somewhere, somehow, something went wrong*
> I updated my Gemfile about a week ago, and thought I got everything working
> because my pages were loading and Compass and Sass were no longer grumbling
> at me. For some horrible reason I didn't run any of my tests. But it turns
> out I've been getting this error since then whenever I call an action (such
> as "packlet.destroy") that tries to send this new_submission email:
>
> ActionView::Template::Error (undefined method `children' for nil:NilClass):
>   app/mailers/notifications.rb:25:in `block in new_submission'
>   app/mailers/notifications.rb:23:in `new_submission'
>   app/models/submission.rb:62:in `has_been'
>   app/models/packlet.rb:20:in `destroy'
>   app/controllers/packlets_controller.rb:27:in `destroy'
>
> Line 26 of app/mailers/notifications is the "format.html" line, shown
> above.
>
> I have narrowed this down to a problem with haml/sass 3.1 by doing this
> bundle update more granularly. I updated Rails, ran my tests, no problems. I
> updated haml, ran my tests, and this pops out in four places.
>
> Any guidance would be greatly appreciated.
>
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