ruby-on-rails - 无法使用 Assets :precompile 在 rails rake 上复制 NilClass

Question

当我尝试预编译我的 Assets 时，出现以下错误。这是具有完整输出的跟踪:

RAILS_ENV=production bundle exec 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!
TypeError: can't dup NilClass
/var/lib/gems/2.3.0/gems/redis-activesupport-5.0.3/lib/active_support/cache/redis_store.rb:38:in `dup'
/var/lib/gems/2.3.0/gems/redis-activesupport-5.0.3/lib/active_support/cache/redis_store.rb:38:in `map'
/var/lib/gems/2.3.0/gems/redis-activesupport-5.0.3/lib/active_support/cache/redis_store.rb:38:in `initialize'
/var/lib/gems/2.3.0/gems/activesupport-5.0.5/lib/active_support/cache.rb:60:in `new'
/var/lib/gems/2.3.0/gems/activesupport-5.0.5/lib/active_support/cache.rb:60:in `lookup_store'
/var/lib/gems/2.3.0/gems/railties-5.0.5/lib/rails/application/bootstrap.rb:64:in `block in <module:Bootstrap>'
/var/lib/gems/2.3.0/gems/railties-5.0.5/lib/rails/initializable.rb:30:in `instance_exec'
/var/lib/gems/2.3.0/gems/railties-5.0.5/lib/rails/initializable.rb:30:in `run'
/var/lib/gems/2.3.0/gems/railties-5.0.5/lib/rails/initializable.rb:55:in `block in run_initializers'
/usr/lib/ruby/2.3.0/tsort.rb:228:in `block in tsort_each'
/usr/lib/ruby/2.3.0/tsort.rb:350:in `block (2 levels) in each_strongly_connected_component'
/usr/lib/ruby/2.3.0/tsort.rb:431:in `each_strongly_connected_component_from'
/usr/lib/ruby/2.3.0/tsort.rb:349:in `block in each_strongly_connected_component'
/usr/lib/ruby/2.3.0/tsort.rb:347:in `each'
/usr/lib/ruby/2.3.0/tsort.rb:347:in `call'
/usr/lib/ruby/2.3.0/tsort.rb:347:in `each_strongly_connected_component'
/usr/lib/ruby/2.3.0/tsort.rb:226:in `tsort_each'
/usr/lib/ruby/2.3.0/tsort.rb:205:in `tsort_each'
/var/lib/gems/2.3.0/gems/railties-5.0.5/lib/rails/initializable.rb:54:in `run_initializers'
/var/lib/gems/2.3.0/gems/railties-5.0.5/lib/rails/application.rb:352:in `initialize!'
/home/alex/Dev/livingrecipe/config/environment.rb:5:in `<top (required)>'
/var/lib/gems/2.3.0/gems/activesupport-5.0.5/lib/active_support/dependencies.rb:293:in `require'
/var/lib/gems/2.3.0/gems/activesupport-5.0.5/lib/active_support/dependencies.rb:293:in `block in require'
/var/lib/gems/2.3.0/gems/activesupport-5.0.5/lib/active_support/dependencies.rb:259:in `load_dependency'
/var/lib/gems/2.3.0/gems/activesupport-5.0.5/lib/active_support/dependencies.rb:293:in `require'
/var/lib/gems/2.3.0/gems/railties-5.0.5/lib/rails/application.rb:328:in `require_environment!'
/var/lib/gems/2.3.0/gems/railties-5.0.5/lib/rails/application.rb:448:in `block in run_tasks_blocks'
/var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/task.rb:250:in `block in execute'
/var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/task.rb:250:in `each'
/var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/task.rb:250:in `execute'
/var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/task.rb:194:in `block in invoke_with_call_chain'
/usr/lib/ruby/2.3.0/monitor.rb:214:in `mon_synchronize'
/var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/task.rb:187:in `invoke_with_call_chain'
/var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/task.rb:180:in `invoke'
/var/lib/gems/2.3.0/gems/sprockets-rails-3.2.0/lib/sprockets/rails/task.rb:62:in `block (2 levels) in define'
/var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/task.rb:250:in `block in execute'
/var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/task.rb:250:in `each'
/var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/task.rb:250:in `execute'
/var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/task.rb:194:in `block in invoke_with_call_chain'
/usr/lib/ruby/2.3.0/monitor.rb:214:in `mon_synchronize'
/var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/task.rb:187:in `invoke_with_call_chain'
/var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/task.rb:216:in `block in invoke_prerequisites'
/var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/task.rb:214:in `each'
/var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/task.rb:214:in `invoke_prerequisites'
/var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/task.rb:193:in `block in invoke_with_call_chain'
/usr/lib/ruby/2.3.0/monitor.rb:214:in `mon_synchronize'
/var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/task.rb:187:in `invoke_with_call_chain'
/var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/task.rb:180:in `invoke'
/var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/application.rb:152:in `invoke_task'
/var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/application.rb:108:in `block (2 levels) in top_level'
/var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/application.rb:108:in `each'
/var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/application.rb:108:in `block in top_level'
/var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/application.rb:117:in `run_with_threads'
/var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/application.rb:102:in `top_level'
/var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/application.rb:80:in `block in run'
/var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/application.rb:178:in `standard_exception_handling'
/var/lib/gems/2.3.0/gems/rake-12.0.0/lib/rake/application.rb:77:in `run'
/var/lib/gems/2.3.0/gems/rake-12.0.0/exe/rake:27:in `<top (required)>'
/usr/local/bin/rake:23:in `load'
/usr/local/bin/rake:23:in `<main>'

所以不幸的是我无法弄清楚错误指向哪里，因为没有代码是我的东西，主要是跟踪由默认 gem 中的代码组成。我可以看到我在其中添加的一件事是 Bootstrap gem，但即使我将其取出，也会发生同样的事情。

Answer 1

看起来你的 redis 连接(或设置)不正确

调试它:

1) 在 Rails 控制台中调试 redis 连接。 Using Redis from your application

>> require 'rubygems'
=> false
>> require 'redis'
=> true
>> r = Redis.new
=> #<Redis client v2.2.1 connected to redis://127.0.0.1:6379/0 (Redis v2.3.8)>
>> r.ping
=> "PONG"
>> r.set('foo','bar')
=> "OK"
>> r.get('foo')
=> "bar"

2) 调试 RedisStore

RedisStore.new("localhost:6379/0/cache", expires_in: 90.minutes)

3) 如果命令通过，请按照 gem redis-rails 中的描述为您的应用设置此配置。

# config/application.rb
config.cache_store = :redis_store, "redis://localhost:6379/0/cache", { expires_in: 90.minutes }

4) 稍微尝试一下配置以建立与 redis 的成功连接(并且不要忘记生产中的不同环境配置!!!)

5) 提交更改，重新部署。