ruby-on-rails – 如何在Heroku上的rails应用程序上完全关闭资产

-----> Preparing app for Rails asset pipeline
       Running: rake assets:precompile
       rake aborted!
       could not connect to server: Connection refused
       Is the server running on host "127.0.0.1" and accepting
       TCP/IP connections on port 5432?
       /tmp/build_3pneyggcg60ks/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.14/lib/active_record/connection_adapters/postgresql_adapter.rb:1222:in `initialize'
       /tmp/build_3pneyggcg60ks/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.14/lib/active_record/connection_adapters/postgresql_adapter.rb:1222:in `new'
       /tmp/build_3pneyggcg60ks/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.14/lib/active_record/connection_adapters/postgresql_adapter.rb:1222:in `connect'
...

所以我把它放到我的application.rb中：

config.assets.enabled = false
config.serve_static_assets = false
config.assets.compile = false

但是在部署时我仍然得到相同的消息.

如何在heroku上完全关闭资产编译/处理？