rake assets：預編譯NoMethodError：undefined方法`tr'for nil：NilClass

Question

我有一個簡單的rails應用程序，我試圖通過Capistrano回覆。該應用程序在開發中工作正常，但未能部署。我將其追溯到資產：預編譯步驟，在我的本地計算機上也失敗。我在其他一些相同的問題上看到過其他一些帖子，但沒有任何真正指向正確方向的東西。

我不夠強大，不知道在哪裏看下一個，所以任何指針將不勝感激。

Solara:myapp dan$ rake assets:precompile --trace 
** Invoke assets:precompile (first_time) 
** Invoke assets:environment (first_time) 
** Execute assets:environment 
** Invoke environment (first_time) 
** Execute environment 
rake aborted! 
NoMethodError: undefined method `tr' for nil:NilClass 
/Users/dan/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.2.4/lib/active_record/connection_adapters/connection_specification.rb:37:in `initialize' 
/Users/dan/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.2.4/lib/active_record/connection_adapters/connection_specification.rb:270:in `new' 
/Users/dan/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.2.4/lib/active_record/connection_adapters/connection_specification.rb:270:in `resolve_url_connection' 
/Users/dan/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.2.4/lib/active_record/connection_adapters/connection_specification.rb:258:in `resolve_hash_connection' 
/Users/dan/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.2.4/lib/active_record/connection_adapters/connection_specification.rb:215:in `resolve_connection' 
/Users/dan/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.2.4/lib/active_record/connection_adapters/connection_specification.rb:139:in `resolve' 
/Users/dan/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.2.4/lib/active_record/connection_adapters/connection_specification.rb:151:in `block in resolve_all' 
/Users/dan/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.2.4/lib/active_record/connection_adapters/connection_specification.rb:150:in `each' 
/Users/dan/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.2.4/lib/active_record/connection_adapters/connection_specification.rb:150:in `resolve_all' 
/Users/dan/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.2.4/lib/active_record/connection_handling.rb:69:in `resolve' 
/Users/dan/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.2.4/lib/active_record/core.rb:46:in `configurations=' 
/Users/dan/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.2.4/lib/active_record/railtie.rb:117:in `block (2 levels) in <class:Railtie>' 
/Users/dan/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.2.4/lib/active_support/lazy_load_hooks.rb:38:in `instance_eval' 
/Users/dan/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.2.4/lib/active_support/lazy_load_hooks.rb:38:in `execute_hook' 
/Users/dan/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.2.4/lib/active_support/lazy_load_hooks.rb:28:in `block in on_load' 
/Users/dan/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.2.4/lib/active_support/lazy_load_hooks.rb:27:in `each' 
/Users/dan/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.2.4/lib/active_support/lazy_load_hooks.rb:27:in `on_load' 
/Users/dan/.rvm/gems/ruby-2.0.0-p247/gems/activerecord-4.2.4/lib/active_record/railtie.rb:116:in `block in <class:Railtie>' 
/Users/dan/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.2.4/lib/rails/initializable.rb:30:in `instance_exec' 
/Users/dan/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.2.4/lib/rails/initializable.rb:30:in `run' 
/Users/dan/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.2.4/lib/rails/initializable.rb:55:in `block in run_initializers' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/tsort.rb:226:in `block in tsort_each' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/tsort.rb:348:in `block (2 levels) in each_strongly_connected_component' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/tsort.rb:429:in `each_strongly_connected_component_from' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/tsort.rb:347:in `block in each_strongly_connected_component' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/tsort.rb:345:in `each' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/tsort.rb:345:in `call' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/tsort.rb:345:in `each_strongly_connected_component' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/tsort.rb:224:in `tsort_each' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/tsort.rb:203:in `tsort_each' 
/Users/dan/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.2.4/lib/rails/initializable.rb:54:in `run_initializers' 
/Users/dan/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.2.4/lib/rails/application.rb:352:in `initialize!' 
/Users/dan/Rails/myapp/config/environment.rb:5:in `<top (required)>' 
/Users/dan/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.2.4/lib/active_support/dependencies.rb:274:in `require' 
/Users/dan/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.2.4/lib/active_support/dependencies.rb:274:in `block in require' 
/Users/dan/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.2.4/lib/active_support/dependencies.rb:240:in `load_dependency' 
/Users/dan/.rvm/gems/ruby-2.0.0-p247/gems/activesupport-4.2.4/lib/active_support/dependencies.rb:274:in `require' 
/Users/dan/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.2.4/lib/rails/application.rb:328:in `require_environment!' 
/Users/dan/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.2.4/lib/rails/application.rb:457:in `block in run_tasks_blocks' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/rake/task.rb:240:in `call' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/rake/task.rb:240:in `block in execute' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/rake/task.rb:235:in `each' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/rake/task.rb:235:in `execute' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/rake/task.rb:179:in `block in invoke_with_call_chain' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/rake/task.rb:172:in `invoke_with_call_chain' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/rake/task.rb:165:in `invoke' 
/Users/dan/.rvm/gems/ruby-2.0.0-p247/gems/sprockets-rails-2.3.3/lib/sprockets/rails/task.rb:64:in `block (2 levels) in define' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/rake/task.rb:240:in `call' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/rake/task.rb:240:in `block in execute' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/rake/task.rb:235:in `each' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/rake/task.rb:235:in `execute' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/rake/task.rb:179:in `block in invoke_with_call_chain' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/rake/task.rb:172:in `invoke_with_call_chain' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/rake/task.rb:201:in `block in invoke_prerequisites' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/rake/task.rb:199:in `each' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/rake/task.rb:199:in `invoke_prerequisites' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/rake/task.rb:178:in `block in invoke_with_call_chain' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/rake/task.rb:172:in `invoke_with_call_chain' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/rake/task.rb:165:in `invoke' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/rake/application.rb:150:in `invoke_task' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/rake/application.rb:106:in `block (2 levels) in top_level' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/rake/application.rb:106:in `each' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/rake/application.rb:106:in `block in top_level' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/rake/application.rb:115:in `run_with_threads' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/rake/application.rb:100:in `top_level' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/rake/application.rb:78:in `block in run' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/rake/application.rb:176:in `standard_exception_handling' 
/Users/dan/.rbenv/versions/2.2.0/lib/ruby/2.2.0/rake/application.rb:75:in `run' 
/Users/dan/.rbenv/versions/2.2.0/bin/rake:33:in `<main>' 
Tasks: TOP => environment 
Solara:wingnut dan$ 

Answer 1

看起來像一個問題瓦特/你的數據庫設置，可能在config/database.yml

這裏是的投擲的錯誤代碼：

# == Example 
# 
# url = "postgresql://foo:bar@localhost:9000/foo_test?pool=5&timeout=3000" 
# ConnectionUrlResolver.new(url).to_hash 
# # => { 
#  "adapter" => "postgresql", 
#  "host"  => "localhost", 
#  "port"  => 9000, 
#  "database" => "foo_test", 
#  "username" => "foo", 
#  "password" => "bar", 
#  "pool"  => "5", 
#  "timeout" => "3000" 
# } 
def initialize(url) 
    raise "Database URL cannot be empty" if url.blank? 
    @uri  = uri_parser.parse(url) 
    @adapter = @uri.scheme.tr('-', '_') 

所以出於某種原因無法弄清楚你想要連接什麼類型的數據庫（如PostgreSQL）。如果您仍然遇到問題，請將您的內容database.yml記住刪除您的密碼。