In order to debug javascript in my heroku production environment, I need to disable asset compression (or at least compression of javascript).  I tried config.assets.c         
        
I came up with this workaround after reading the docs:
create a module that does nothing to compress js / css here: lib/modules/no_compression.rb
class NoCompression
  def compress(string)
    # do nothing
    string
  end
end
configure your assets to (not) be compressed with your do-nothing compressor
config.assets.compress = true
config.assets.js_compressor = NoCompression.new
config.assets.css_compressor = NoCompression.new