Including CoffeeScript file in rails -

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i have taken @ coffeescript , want try out in rails app. know rails 3.1 coffeescript included within rails. having issues getting work.

i have file called lens.js have renamed lens.js.coffee, , converted js coffee. screen casts have seen , blogs have read seemed needed. not picking file somehow. 

get http://www.cairo.dev/javascripts/lens.js 404 (not found)

is console dropping. including other js files.

= javascript_include_tag 'lens', 'jquery-ui.min', 'rails', 'application', 'popup', 'jquery.zclip', 'underscore-min'

note: link haml

which should work since compiles coffeescript js. wondered if wasn't installed added gem 'coffee-script' gemfile , bundled still nothing.

am doing stupid. or missing?

try not add gem 'coffee-script' in gemfile but:

group :assets   gem 'coffee-rails' end

if doesn't work, can try removing lens javascript_include_tag , make sure have line in application.js: 

//= require_tree .

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