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copied!<p>The idea is that if you don't change your assets you don't need to recompile them each time:</p> <p>This is the <a href="http://www.bencurtis.com/2011/12/skipping-asset-compilation-with-capistrano/" rel="noreferrer">solution that Ben Curtis propose</a> for a deployment with git:</p> <pre><code> namespace :deploy do namespace :assets do task :precompile, :roles => :web, :except => { :no_release => true } do from = source.next_revision(current_revision) if releases.length <= 1 || capture("cd #{latest_release} && #{source.local.log(from)} vendor/assets/ app/assets/ | wc -l").to_i > 0 run %Q{cd #{latest_release} && #{rake} RAILS_ENV=#{rails_env} #{asset_env} assets:precompile} else logger.info "Skipping asset pre-compilation because there were no asset changes" end end end end </code></pre> <p>Here is another approach based on asset age (<a href="https://gist.github.com/2784462" rel="noreferrer">https://gist.github.com/2784462</a>) :</p> <pre><code>set :max_asset_age, 2 ## Set asset age in minutes to test modified date against. after "deploy:finalize_update", "deploy:assets:determine_modified_assets", "deploy:assets:conditionally_precompile" namespace :deploy do namespace :assets do desc "Figure out modified assets." task :determine_modified_assets, :roles => assets_role, :except => { :no_release => true } do set :updated_assets, capture("find #{latest_release}/app/assets -type d -name .git -prune -o -mmin -#{max_asset_age} -type f -print", :except => { :no_release => true }).split end desc "Remove callback for asset precompiling unless assets were updated in most recent git commit." task :conditionally_precompile, :roles => assets_role, :except => { :no_release => true } do if(updated_assets.empty?) callback = callbacks[:after].find{|c| c.source == "deploy:assets:precompile" } callbacks[:after].delete(callback) logger.info("Skipping asset precompiling, no updated assets.") else logger.info("#{updated_assets.length} updated assets. Will precompile.") end end end end </code></pre> <p>If you prefer to precompile your assets locally you can use this task:</p> <pre><code>namespace :deploy do namespace :assets do desc 'Run the precompile task locally and rsync with shared' task :precompile, :roles => :web, :except => { :no_release => true } do from = source.next_revision(current_revision) if releases.length <= 1 || capture("cd #{latest_release} && #{source.local.log(from)} vendor/assets/ app/assets/ | wc -l").to_i > 0 %x{bundle exec rake assets:precompile} %x{rsync --recursive --times --rsh=ssh --compress --human-readable --progress public/assets #{user}@#{host}:#{shared_path}} %x{bundle exec rake assets:clean} else logger.info 'Skipping asset pre-compilation because there were no asset changes' end end end end </code></pre> <p>Another interesting approach can be that of using a <strong>git hook</strong>. For example you can add this code to <code>.git/hooks/pre-commit</code> which checks if there are any differences in the assets files and eventually precompiles them and add them to the current commit.</p> <pre><code>#!/bin/bash # source rvm and .rvmrc if present [ -s "$HOME/.rvm/scripts/rvm" ] && . "$HOME/.rvm/scripts/rvm" [ -s "$PWD/.rvmrc" ] && . "$PWD/.rvmrc" # precompile assets if any have been updated if git diff-index --name-only HEAD | egrep '^app/assets' >/dev/null ; then echo 'Precompiling assets...' rake assets:precompile:all RAILS_ENV=production RAILS_GROUPS=assets git add public/assets/* fi </code></pre> <p>If you decide to use this approach you would probably need to change your <code>config/environments/development.rb</code> adding:</p> <pre><code>config.assets.prefix = '/assets_dev' </code></pre> <p>So that while in development you won't serve the precompiled assets.</p>

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