uninitialized constant Haml::Filters::SassImporter

[such]

Hello,
I've stumbled across this issue when upgrading my app to Rails 4.2.

It can be reproduced with a new rails project.

• add following gem dependencies:

gem 'haml-rails', '~> 0.5.3'
gem 'compass-rails', '~> 2.0.3'

• rename application.css in application.css.scss and add @import 'compass';
• add the following config in application.rb:
  config.assets.enabled = true (important part!)
• generate a model, a controller and view. In the view add inline scss:

:scss
  h1 {
    color: yellow;
  }

When trying to access the view, the following error will be raised:

ActionView::Template::Error (uninitialized constant Haml::Filters::SassImporter):
  compass-rails (2.0.3) lib/compass-rails/patches/sass_importer.rb:58:in `sass_importer_artiy'
  compass-rails (2.0.3) lib/compass-rails/patches/sass_importer.rb:63:in `sass_importer'
  compass-rails (2.0.3) lib/compass-rails/patches/sass_importer.rb:18:in `block in evaluate'
  compass-rails (2.0.3) lib/compass-rails/patches/sass_importer.rb:18:in `map'
  compass-rails (2.0.3) lib/compass-rails/patches/sass_importer.rb:18:in `evaluate'
  tilt (1.4.1) lib/tilt/template.rb:103:in `render'
  haml (4.0.6) lib/haml/sass_rails_filter.rb:8:in `render'
  (eval):5:in `render_with_options'
  haml (4.0.6) lib/haml/filters.rb:184:in `block in compile'
  haml (4.0.6) lib/haml/filters.rb:162:in `instance_eval'
  haml (4.0.6) lib/haml/filters.rb:162:in `compile'
  haml (4.0.6) lib/haml/filters.rb:141:in `internal_compile'
  haml (4.0.6) lib/haml/compiler.rb:273:in `compile_filter'
  haml (4.0.6) lib/haml/compiler.rb:20:in `compile'
  haml (4.0.6) lib/haml/compiler.rb:22:in `block (2 levels) in compile'
  haml (4.0.6) lib/haml/compiler.rb:22:in `each'
  haml (4.0.6) lib/haml/compiler.rb:22:in `block in compile'
  haml (4.0.6) lib/haml/compiler.rb:95:in `compile_root'
  haml (4.0.6) lib/haml/compiler.rb:22:in `compile'
  haml (4.0.6) lib/haml/engine.rb:66:in `initialize'
  haml (4.0.6) lib/haml/template/plugin.rb:25:in `new'
  haml (4.0.6) lib/haml/template/plugin.rb:25:in `compile'
  haml (4.0.6) lib/haml/template/plugin.rb:30:in `call'

As a workaround, I prevented the load of sass_rails_filter by removing config.assets.enabled = true in application.rb (it's supposed to be by default now anyway). If I understand correctly it only prevents me from using rails helpers in inline sass.

As a sidenote, the test app.config.assets.enabled in haml-4.0.6/lib/haml/railtie.rb seems buggy since app.config.assets.enabled is nil for a new rails app even though asset pipeline is enabled by default...

Please tell me if you need any more information.
You might also consider that the issue belongs to compass-rails... Let me know!

[frahugo]

+1

I get the error in a view rendered by ActionMailer as well

[frahugo]

I downgraded sass-rails to 4.0.5 and compass-rails to '1.1.7' and it solved the problem on my side. Strange.

[frahugo]

Oh well, now I'm having this error Unsupported rails environment for compass in some of my tests. I would have to move back up to compass-rails v2.

Everything works fine now with the latest compass-rails (2.0.0) and an old sass-rails version: 4.0.5

[reidnimz]

I believe this is a bug compass-rails, as sass-rails changed out from underneath it. I'll try and get a solution in.