Rails 3.2.1，部署资源预编译两次？

Question

我有这样的任务Capistrano的：

namespace :deploy do 
    task :precompile, :role => :app do 
    run "cd #{release_path}/ && RAILS_ENV=staging bundle exec rake assets:precompile --trace" 
    end 
end 

after "deploy:finalize_update", "deploy:precompile" 

我知道，有load 'deploy/assets'但我想了解是怎么回事。

我部署到Amazon EC2上的m1.small情况下，这显然有不断50％的CPU偷时间，与top验证。 这导致增加的时间编制资产，但看看这个：

[23.21.xxx.xx] rvm_path=$HOME/.rvm/ $HOME/.rvm/bin/rvm-shell 'ruby-1.9.3-p125' -c 'cd /home/ubuntu/apps/myapp-rails/releases/20120227020245/ && RAILS_ENV=staging bundle exec rake assets:precompile --trace' 
** [out :: 23.21.xxx.xx] ** Invoke assets:precompile (first_time) 
** [out :: 23.21.xxx.xx] ** Execute assets:precompile 
** [out :: 23.21.xxx.xx] /home/ubuntu/.rvm/rubies/ruby-1.9.3-p125/bin/ruby /home/ubuntu/apps/myapp-rails/shared/bundle/ruby/1.9.1/bin/rake assets:precompile:all RAILS_ENV=staging RAILS_GROUPS=assets --trace 
** [out :: 23.21.xxx.xx] ** Invoke assets:precompile:all (first_time) 
** [out :: 23.21.xxx.xx] ** Execute assets:precompile:all 
** [out :: 23.21.xxx.xx] ** Invoke assets:precompile:primary (first_time) 
** [out :: 23.21.xxx.xx] ** Invoke assets:environment (first_time) 
** [out :: 23.21.xxx.xx] ** Execute assets:environment 
** [out :: 23.21.xxx.xx] ** Invoke environment (first_time) 
** [out :: 23.21.xxx.xx] ** Execute environment 
** [out :: 23.21.xxx.xx] ** Invoke tmp:cache:clear (first_time) 
** [out :: 23.21.xxx.xx] ** Execute tmp:cache:clear 
** [out :: 23.21.xxx.xx] ** Execute assets:precompile:primary 
** [out :: 23.21.xxx.xx] ** Invoke assets:precompile:nondigest (first_time) 
** [out :: 23.21.xxx.xx] ** Invoke assets:environment (first_time) 
** [out :: 23.21.xxx.xx] ** Execute assets:environment 
** [out :: 23.21.xxx.xx] ** Invoke environment (first_time) 
** [out :: 23.21.xxx.xx] ** Execute environment 
** [out :: 23.21.xxx.xx] ** Invoke tmp:cache:clear (first_time) 
** [out :: 23.21.xxx.xx] ** Execute tmp:cache:clear 
** [out :: 23.21.xxx.xx] ** Execute assets:precompile:nondigest 
    command finished in 958131ms 

除了花在出于某种原因，我可以说这是编译他们两次预编译的资产疯狂的时间。为什么？

我正在使用Rails 3.2.1。 有人可以提供一些关于这里发生了什么的见解吗？它的目的是？

staging.rb 

    # Compress JavaScripts and CSS 
    config.assets.compress = true 

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

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

Answer 1

load 'deploy/assets'自动预编译为您的资产部署的适当部分，所以你并不需要定义一个预编译任务。您可以删除预编译任务和after "deploy:finalize_update", "deploy:precompile"。

https://github.com/capistrano/capistrano/blob/master/lib/capistrano/recipes/deploy/assets.rb

编辑：默认情况下Rails会创建指纹文件和非指纹的文件时，你已经消化设置为true。它实际上并不是两次运行整个预编译任务，它只是针对每种情况运行一项任务。

如果要禁止完全生成非指纹文件，则可以覆盖assets:precompile:all任务。

Rake::Task['assets:precompile:all'].clear 
namespace :assets do 
    namespace :precompile do 
    task :all do 
     Rake::Task['assets:precompile:primary'].invoke 
     # ruby_rake_task("assets:precompile:nondigest", false) if Rails.application.config.assets.digest 
    end 
    end 
end 

注释掉线是在这里第66行：

https://github.com/rails/rails/blob/master/actionpack/lib/sprockets/assets.rake