通过未定义的方法预编译资产错误答案

【问题标题】：Precompile Assets Error By Undefined Method通过未定义的方法预编译资产错误
【发布时间】：2016-01-30 02:12:31
【问题描述】：

我一直在为我的应用做一些工作，最近我跑了

rake assets:precompile:primary RAILS_ENV=production --trace

最终结果是这个错误：

NoMethodError: undefined method 'bytesize' for nil:NilClass

根本没有信息，跟踪对我帮助不大

** Invoke assets:precompile:primary (first_time)
** Invoke assets:environment (first_time)
** Execute assets:environment
** Invoke tmp:cache:clear (first_time)
** Execute tmp:cache:clear
** Execute assets:precompile:primary
rake aborted!
NoMethodError: undefined method `bytesize' for nil:NilClass
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/rack-1.4.7/lib/rack/utils.rb:300:in `bytesize'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/processed_asset.rb:13:in `initialize'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/base.rb:249:in `new'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/base.rb:249:in `block in build_asset'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/base.rb:270:in `circular_call_protection'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/base.rb:248:in `build_asset'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/index.rb:93:in `block in build_asset'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/caching.rb:19:in `cache_asset'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/index.rb:92:in `build_asset'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/base.rb:169:in `find_asset'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/index.rb:60:in `find_asset'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/processed_asset.rb:111:in `block in resolve_dependencies'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/processed_asset.rb:105:in `each'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/processed_asset.rb:105:in `resolve_dependencies'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/processed_asset.rb:97:in `build_required_assets'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/processed_asset.rb:16:in `initialize'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/base.rb:249:in `new'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/base.rb:249:in `block in build_asset'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/base.rb:270:in `circular_call_protection'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/base.rb:248:in `build_asset'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/index.rb:93:in `block in build_asset'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/caching.rb:19:in `cache_asset'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/index.rb:92:in `build_asset'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/base.rb:169:in `find_asset'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/index.rb:60:in `find_asset'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/bundled_asset.rb:16:in `initialize'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/base.rb:252:in `new'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/base.rb:252:in `build_asset'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/index.rb:93:in `block in build_asset'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/caching.rb:19:in `cache_asset'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/index.rb:92:in `build_asset'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/base.rb:169:in `find_asset'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/index.rb:60:in `find_asset'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/environment.rb:78:in `find_asset'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/actionpack-3.2.22.1/lib/sprockets/static_compiler.rb:19:in `block in compile'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/base.rb:219:in `block in each_logical_path'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/base.rb:206:in `block (2 levels) in each_file'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/base.rb:196:in `each'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/base.rb:196:in `each_entry'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/base.rb:204:in `block in each_file'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/base.rb:203:in `each'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/base.rb:203:in `each_file'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/sprockets-2.2.3/lib/sprockets/base.rb:217:in `each_logical_path'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/actionpack-3.2.22.1/lib/sprockets/static_compiler.rb:18:in `compile'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/actionpack-3.2.22.1/lib/sprockets/assets.rake:56:in `internal_precompile'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/actionpack-3.2.22.1/lib/sprockets/assets.rake:70:in `block (3 levels) in <top (required)>'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/rake-10.5.0/lib/rake/task.rb:240:in `call'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/rake-10.5.0/lib/rake/task.rb:240:in `block in execute'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/rake-10.5.0/lib/rake/task.rb:235:in `each'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/rake-10.5.0/lib/rake/task.rb:235:in `execute'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/rake-10.5.0/lib/rake/task.rb:179:in `block in invoke_with_call_chain'
/Users/jasontanner/.rvm/rubies/ruby-2.0.0-p643/lib/ruby/2.0.0/monitor.rb:211:in `mon_synchronize'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/rake-10.5.0/lib/rake/task.rb:172:in `invoke_with_call_chain'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/rake-10.5.0/lib/rake/task.rb:165:in `invoke'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/rake-10.5.0/lib/rake/application.rb:150:in `invoke_task'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/rake-10.5.0/lib/rake/application.rb:106:in `block (2 levels) in top_level'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/rake-10.5.0/lib/rake/application.rb:106:in `each'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/rake-10.5.0/lib/rake/application.rb:106:in `block in top_level'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/rake-10.5.0/lib/rake/application.rb:115:in `run_with_threads'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/rake-10.5.0/lib/rake/application.rb:100:in `top_level'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/rake-10.5.0/lib/rake/application.rb:78:in `block in run'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/rake-10.5.0/lib/rake/application.rb:176:in `standard_exception_handling'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/rake-10.5.0/lib/rake/application.rb:75:in `run'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/gems/rake-10.5.0/bin/rake:33:in `<top (required)>'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/bin/rake:19:in `load'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/bin/rake:19:in `<main>'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/bin/ruby_executable_hooks:15:in `eval'
/Users/jasontanner/.rvm/gems/ruby-2.0.0-p643/bin/ruby_executable_hooks:15:in `<main>'
Tasks: TOP => assets:precompile:primary

这是我的生产环境文件。

Galapal::Application.configure do
  # Settings specified here will take precedence over those in config/application.rb

  # In the development environment your application's code is reloaded on
  # every request. This slows down response time but is perfect for development
  # since you don't have to restart the web server when you make code changes.
  config.cache_classes = true

  # Log error messages when you accidentally call methods on nil.
  config.whiny_nils = true

  # Show full error reports and disable caching
  config.consider_all_requests_local       = true
  config.action_controller.perform_caching = false

  # Don't care if the mailer can't send
  config.action_mailer.raise_delivery_errors = false

  # Print deprecation notices to the Rails logger
  config.active_support.deprecation = :log

  # For angular js compression
  config.assets.js_compressor = Uglifier.new(mangle: false)

  # Only use best-standards-support built into browsers
  config.action_dispatch.best_standards_support = :builtin

  # Raise exception on mass assignment protection for Active Record models
  config.active_record.mass_assignment_sanitizer = :strict

  # Log the query plan for queries taking more than this (works
  # with SQLite, MySQL, and PostgreSQL)
  config.active_record.auto_explain_threshold_in_seconds = 0.5

  # Do not compress assets
  config.assets.compress = true

  config.assets..serve_static_assets = true  

  # Expands the lines which load the assets
  config.assets.debug = false

  # Expands the lines which load the assets
  config.assets.debug = false

  #ActiveRecord::Base.logger = Logger.new STDOUT


end

所以我的问题是这样的。为什么我不能预编译我的资产，我该如何解决这个问题？我正在运行 Rails 3.2.22。

【问题讨论】：

你有哪个版本的 rake？
我对这个问题做了一些研究，似乎至少有两个原因会发生这种情况：1）您有空资产 2）您的一个资产中有非 utf8 字符（检查代码中带有重音符号等的 cmets）。请参阅此以供参考，具体要求通过“在 application.css 的底部添加一个空类”github.com/zweilove/css_splitter/issues/12 解决问题的人@ 也可以尝试通过从清单中删除所有资产然后开始一一添加来尝试调试直到它破裂。祝你好运！
@МалъСкрылевъ rake，版本 10.4.2
@rii，我去看看。我认为这可能是资产，但完成这是一项艰巨的任务。我知道我没有任何空文件。我会寻找非 utf8 字符。
是的，您可以暂时将它们全部注释掉，看看是否确实是这个原因。如果它有效，请取消注释其中的一半，看看它是否发生。如果发生这种情况，那么至少您知道问题出在哪一半资产中，依此类推。

标签： javascript css ruby-on-rails ruby asset-pipeline

【解决方案1】：

我对这个问题做了一些研究，似乎至少有两个原因：

1) 你有空资产

2) 您的一项资产中有非 utf8 字符（检查代码中带有重音符号等的 cmets）。

请参阅此以获取有关“要求”的参考，特别是通过“在 application.css 的底部添加一个空类”来解决问题的人 github.com/zweilove/css_splitter/issues/12 。也可以尝试通过删除来进行调试清单中的所有资产，然后开始一一添加，直到它中断。祝你好运！

【讨论】：

【解决方案2】：

我遇到了一个 JavaScript 文件的问题，该文件具有某种奇怪的格式（来自更漂亮的库），Rails 对 .

NoMethodError: undefined method `bytesize' for nil:NilClass
/Users/joel/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/rack-1.6.8/lib/rack/utils.rb:380:in `bytesize'
/Users/joel/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/sprockets-2.12.4/lib/sprockets/processed_asset.rb:13:in `initialize'

为了弄清楚是哪个文件，我挖掘了 gem 路径并在sprockets/processed_asset.rb 添加了一些代码来打印文件：

  context = environment.context_class.new(environment, logical_path, pathname)
  @source = context.evaluate(pathname)
  p pathname
  @length = Rack::Utils.bytesize(source)

下次我编译资产时，它向我展示了罪魁祸首。

【讨论】：