ruby-on-rails - 远程 : ! 预编译 Assets 失败。 (英雄)

Question

因此，我通常不会在将应用程序部署到 heroku 时遇到任何问题，但是，在这种特定情况下，我会遇到预编译失败错误...

这里的这一行对我来说很突出:

remote:        NoMethodError: undefined method `[]' for nil:NilClass

但这里是完整的错误日志:

remote:        Bundle completed (9.35s)
remote:        Cleaning up the bundler cache.
remote:        Removing carrierwave (0.10.0)
remote:        Removing foreigner (1.7.4)
remote:        Removing mailboxer (0.12.5)
remote: -----> Preparing app for Rails asset pipeline
remote:        Running: rake assets:precompile
remote:        rake aborted!
remote:        NoMethodError: undefined method `[]' for nil:NilClass
remote:        (in /tmp/build_3dacd5df86a31726215c3dc3c1c22600/app/assets/stylesheets/application.css)
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sprockets-2.12.3/lib/sprockets/sass_functions.rb:63:in `sprockets_context'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sass-rails-4.0.5/lib/sass/rails/helpers.rb:23:in `asset_url'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sass-3.2.19/lib/sass/script/funcall.rb:113:in `_perform'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sass-3.2.19/lib/sass/script/node.rb:40:in `perform'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sass-3.2.19/lib/sass/tree/visitors/perform.rb:298:in `visit_prop'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sass-3.2.19/lib/sass/tree/visitors/base.rb:37:in `visit'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sass-3.2.19/lib/sass/tree/visitors/perform.rb:100:in `visit'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sass-3.2.19/lib/sass/tree/visitors/base.rb:53:in `block in visit_children'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sass-3.2.19/lib/sass/tree/visitors/base.rb:53:in `map'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sass-3.2.19/lib/sass/tree/visitors/base.rb:53:in `visit_children'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sass-3.2.19/lib/sass/tree/visitors/perform.rb:109:in `block in visit_children'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sass-3.2.19/lib/sass/tree/visitors/perform.rb:121:in `with_environment'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sass-3.2.19/lib/sass/tree/visitors/perform.rb:108:in `visit_children'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sass-3.2.19/lib/sass/tree/visitors/base.rb:37:in `block in visit'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sass-3.2.19/lib/sass/tree/visitors/perform.rb:356:in `visit_directive'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sass-3.2.19/lib/sass/tree/visitors/base.rb:37:in `visit'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sass-3.2.19/lib/sass/tree/visitors/perform.rb:100:in `visit'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sass-3.2.19/lib/sass/tree/visitors/base.rb:53:in `block in visit_children'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sass-3.2.19/lib/sass/tree/visitors/base.rb:53:in `map'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sass-3.2.19/lib/sass/tree/visitors/base.rb:53:in `visit_children'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sass-3.2.19/lib/sass/tree/visitors/perform.rb:109:in `block in visit_children'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sass-3.2.19/lib/sass/tree/visitors/perform.rb:121:in `with_environment'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sass-3.2.19/lib/sass/tree/visitors/perform.rb:108:in `visit_children'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sass-3.2.19/lib/sass/tree/visitors/base.rb:37:in `block in visit'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sass-3.2.19/lib/sass/tree/visitors/perform.rb:128:in `visit_root'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sass-3.2.19/lib/sass/tree/visitors/base.rb:37:in `visit'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sass-3.2.19/lib/sass/tree/visitors/perform.rb:100:in `visit'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sass-3.2.19/lib/sass/tree/visitors/perform.rb:7:in `visit'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sass-3.2.19/lib/sass/tree/root_node.rb:20:in `render'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sass-3.2.19/lib/sass/engine.rb:315:in `_render'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sass-3.2.19/lib/sass/engine.rb:262:in `render'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sprockets-2.12.3/lib/sprockets/sass_compressor.rb:24:in `evaluate'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/tilt-1.4.1/lib/tilt/template.rb:103:in `render'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sprockets-2.12.3/lib/sprockets/context.rb:197:in `block in evaluate'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sprockets-2.12.3/lib/sprockets/context.rb:194:in `each'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sprockets-2.12.3/lib/sprockets/context.rb:194:in `evaluate'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sprockets-2.12.3/lib/sprockets/bundled_asset.rb:25:in `initialize'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sprockets-2.12.3/lib/sprockets/base.rb:377:in `new'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sprockets-2.12.3/lib/sprockets/base.rb:377:in `build_asset'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sprockets-2.12.3/lib/sprockets/index.rb:94:in `block in build_asset'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sprockets-2.12.3/lib/sprockets/caching.rb:58:in `cache_asset'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sprockets-2.12.3/lib/sprockets/index.rb:93:in `build_asset'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sprockets-2.12.3/lib/sprockets/base.rb:287:in `find_asset'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sprockets-2.12.3/lib/sprockets/index.rb:61:in `find_asset'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sprockets-2.12.3/lib/sprockets/manifest.rb:211:in `block in find_asset'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sprockets-2.12.3/lib/sprockets/manifest.rb:257:in `benchmark'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sprockets-2.12.3/lib/sprockets/manifest.rb:210:in `find_asset'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sprockets-2.12.3/lib/sprockets/manifest.rb:119:in `block in compile'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sprockets-2.12.3/lib/sprockets/manifest.rb:118:in `each'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sprockets-2.12.3/lib/sprockets/manifest.rb:118:in `compile'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-2.3.1/lib/sprockets/rails/task.rb:70:in `block (3 levels) in define'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sprockets-2.12.3/lib/rake/sprocketstask.rb:146:in `with_logger'
remote:        /tmp/build_3dacd5df86a31726215c3dc3c1c22600/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-2.3.1/lib/sprockets/rails/task.rb:69:in `block (2 levels) in define'
remote:        Tasks: TOP => assets:precompile
remote:        (See full trace by running task with --trace)
remote:  !
remote:  !     Precompiling assets failed.
remote:  !
remote: 
remote:  !     Push rejected, failed to compile Ruby app
remote: 
remote: Verifying deploy...
remote: 
remote: !   Push rejected to fakename-dev.
remote: 
To git@heroku.com:fakename-dev.git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'git@heroku.com:fakename-dev.git'

我做错了什么，我该如何解决？

干杯!

Answer 1

事情是这样的，我们有 application.css 以某种方式忽略了预编译时其他 .scss 文件中的错误，所以我们有在本地预编译的 Assets 但不能'在 heroku 上预编译它们。

我决定将 application.css 重命名为 application.css.scss 现在当我运行 assets:precompile 任务时我遇到了错误与 heroku 相同，这使我能够调查问题出在哪里。

这是一个缩小的 bootstrap.css 文件(来自设计者)，我们团队的开发人员决定通过缩进它来重构它并更改字体路径而不将扩展名更改为 .scss 以获得可用的 image-url 和 asset-url 助手。无论如何，我放弃了所有这些并使用了解决图标问题的 Bootstrap gem。

总而言之，将 .scss 添加到您的样式表中，以便在预编译时更快地找到问题所在。