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# -*- encoding : utf-8 -*-
set :assets_dependencies, %w(app/assets lib/assets vendor/assets Gemfile.lock config/routes.rb)
namespace :deploy do
namespace :assets do
desc <<-DESC
Run the asset precompilation rake task. You can specify the full path \
to the rake executable by setting the rake variable. You can also \
specify additional environment variables to pass to rake via the \
asset_env variable. The defaults are:
set :rake, "rake"
set :rails_env, "production"
set :asset_env, "RAILS_GROUPS=assets"
set :assets_dependencies, fetch(:assets_dependencies) + %w(config/locales/js)
task :precompile, :roles => :web, :except => { :no_release => true } do
from = source.next_revision(current_revision)
if capture("cd #{latest_release} && #{source.local.log(from)} #{assets_dependencies.join ' '} | wc -l").to_i > 0
run %Q{cd #{latest_release} && #{rake} RAILS_ENV=#{rails_env} #{asset_env} assets:precompile}
else "Skipping asset pre-compilation because there were no asset changes"

When I use this and the default assets:precompile task isn't run on deploy. I get errors about, ____ isn't precompiled. Does this assume we're symlinking our public/assets directory outside of the current deploy directory? Thanks!


Well to answer my own question, yes this does require that you symlink your public/assets directory outside of the current deploy. This works like a charm though, thanks for sharing!


Hi there,

I've just written a gem to solve this problem inside Rails, called turbo-sprockets-rails3. It speeds up your assets:precompile by only recompiling changed files, and only compiling once to generate all assets. This works out of the box for capistrano, and is a much more bullet-proof solution.

If you are interested, it would be awesome if you could help me test out the turbo-sprockets-rails3 gem, and let me know if you have any problems. It currently only supports Rails 3.2.x, so I apologize if your app is running 3.1.x.


I've tested the gem. It works like a charm. GREAT WORK !!!

namick commented Oct 30, 2012

turbo-sprockets-rails3 is working great for me. Thanks!

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