rake assets:precompile not working on heroku

Question

My website used to be working and Heroku precompiled the assets and everything. Now, seemingly out of nowhere, I started to get rake aborted! stack level too deep on deploy.

Deleting the line *= require_tree . from my application.css file seems to fix thestack level too deep but then I get this:

Running: rake assets:precompile
(in /tmp/build_b8o2t4k8frce)
/usr/local/bin/ruby /tmp/build_b8o2t4k8frce/vendor/bundle/ruby/1.9.1/bin/rake assets:precompile:nondigest RAILS_ENV=production RAILS_GROUPS=assets
(in /tmp/build_b8o2t4k8frce)

All my links to images are broken (I'm using image-url() in my css file). What could be the problem and how do I fix it?

I'm using cedar stack and this is my gemfile:

gem 'rails', '3.1.0'
gem 'rake', '0.8.7'
gem 'devise'

group :production do
  gem 'pg'
  gem 'thin'
end

group :assets do
  gem 'sass-rails', "  ~> 3.1.0"
  gem 'coffee-rails', "~> 3.1.0"
  gem 'uglifier'
end

And here are the versions used by heroku:

Using rake (0.8.7)
Using rails (3.1.0)
Using sass (3.1.15)
Using sass-rails (3.1.6)

Here's my application.rb file

if defined?(Bundler)
  # If you precompile assets before deploying to production, use this line
  Bundler.require *Rails.groups(:assets => %w(development test))
  # If you want your assets lazily compiled in production, use this line
  # Bundler.require(:default, :assets, Rails.env)
end

module App
  class Application < Rails::Application

    # Enable the asset pipeline
    config.assets.enabled = true

    # Version of your assets, change this if you want to expire all your assets.
    config.assets.version = '1.0'
  end
end

And here's my production.rb file

# Full error reports are disabled and caching is turned on
config.consider_all_requests_local       = false
config.action_controller.perform_caching = true

# Enable Rails's static asset server (Apache or nginx will not need this)
config.serve_static_assets = true

# Set expire header of 30 days for static files
config.static_cache_control = "public, max-age=2592000"

# Allow JavaScript and CSS compression
config.assets.compress = true

# Compress JavaScript by removing whitespace, shortening variable names, ...
config.assets.js_compressor = :uglifier

# Don't fallback to assets pipeline if a precompiled asset is missed
config.assets.compile = true

# Generate digests for assets URLs
config.assets.digest = true

Answer 1

I had a similar problem and found the answer here: https://github.com/rails/sass-rails/issues/78. Basically, downgrade to sass-rails v3.1.4. Hope this helps

Answer 2

You shouldn't had to delete this *= require tree . from application.css, coz it loads all you styles. just add it, and configure your config/production.rb file like this:

config.assets.precompile = %w{application.js}

and run RAILS_ENV=production rake assets:precompile

EDIT try to use this config:

config.assets.digest  = true

Answer 3

Apparently sass stopped working and I ran out of patience so I decided not to use it anymore. Instead of doing this:

#theme.css.scss
background-image:image-url('image.png');

Now I am simply using an erb file:

#theme.css.erb
background-image:url(<%= asset_path 'image.png' %>);

I just lost a whole day because of this and I have no idea why because it was working fine just yesterday. If somebody knows what caused this and how I can use sass again, please comment.