疑难解答 rails 6、bootstrap 4、heroku 上的 webpacker

Question

Heroku 部署失败。所以我试着在本地做同样的问题。

$ NODE_ENV=production RAILS_ENV=production rails assets:precompile --trace
** Invoke assets:precompile (first_time)
** Invoke assets:environment (first_time)
** Execute assets:environment
** Invoke environment (first_time)
** Execute environment
** Invoke yarn:install (first_time)
** Execute yarn:install
yarn install v1.13.0
[1/4] ????  Resolving packages...
[2/4] ????  Fetching packages...
[3/4] ????  Linking dependencies...
warning " > webpack-dev-server@3.3.1" has unmet peer dependency "webpack@^4.0.0".
warning "webpack-dev-server > webpack-dev-middleware@3.6.2" has unmet peer dependency "webpack@^4.0.0".
[4/4] ????  Building fresh packages...
✨  Done in 7.99s.
** Execute assets:precompile
I, [2019-04-16T12:10:11.016887 #96897]  INFO -- : Writing /private/tmp/template-a32b218/public/assets/application-e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855.css
I, [2019-04-16T12:10:11.017485 #96897]  INFO -- : Writing /private/tmp/template-a32b218/public/assets/application-e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855.css.gz
** Invoke webpacker:compile (first_time)
** Invoke webpacker:verify_install (first_time)
** Invoke webpacker:check_node (first_time)
** Execute webpacker:check_node
** Invoke webpacker:check_yarn (first_time)
** Execute webpacker:check_yarn
** Invoke webpacker:check_binstubs (first_time)
** Execute webpacker:check_binstubs
** Execute webpacker:verify_install
** Invoke environment 
** Execute webpacker:compile
Compiling…
Compilation failed:

$ echo $?
1

Answer 1

如果您在应用程序中实际使用包之前忘记执行“添加纱线”操作，Webpacker 可能会静默挂起。

Answer 2

找到我自己问题的答案。

在config/webpacker.yml 中，有一个布尔选项可以使输出更加详细。它告诉我，我的一个包含语句中有一个错字。