ruby-on-rails - Heroku 部署 - 无法加载此类文件 - rake (LoadError)

Question

我收到错误:

remote:  !     Could not detect rake tasks
 
04:36
 
remote:  !     ensure you can run `$ bundle exec rake -P` against your app
 
04:36
 
remote:  !     and using the production group of your Gemfile.
 
04:36
 
remote:  !     /tmp/build_aa020f9e/bin/rake:8:in `require': cannot load such file -- rake (LoadError)
 
04:36
 
remote:  !     from /tmp/build_aa020f9e/bin/rake:8:in `<main>'

从 Codeship 运行 Heroku 部署管道时

/bin/rake 看起来像这样

#!/usr/bin/env ruby
begin
  load File.expand_path('../spring', __FILE__)
rescue LoadError => e
  raise unless e.message.include?('spring')
end
require_relative '../config/boot'
require 'rake'
Rake.application.run

所以第 8 行需要“rake”

我尝试将 gem rake 显式添加到我的 gemfile

然后因为提到了制作组我尝试了

group :production do
  gem 'rake'
end

这些都不起作用，所以我的代码推送被 Heroku 拒绝了

remote:  !     Push rejected, failed to compile Ruby app.
 
04:36
 
remote: 
 
04:36
 
remote:  !     Push failed

有人有什么想法吗？我在 StackOverflow 上看到类似的帖子 rails cannot load such file -- rake (LoadError)但没有解决方案？

Answer 1

[我已编辑此原始回复以包含解决方案]

我也遇到了这个问题，并且有 Heroku 的开放票证。 遗憾的是，目前还没有回复，但我通过 Google 幸运地在其他地方找到了答案。

上下文，供将来引用和搜索引擎

remote: -----> Detecting rake tasks
remote: 
remote:  !
remote:  !     Could not detect rake tasks
remote:  !     ensure you can run `$ bundle exec rake -P` against your app
remote:  !     and using the production group of your Gemfile.
remote:  !     /tmp/build_b8f358ab/bin/rake:3:in `require': cannot load such file -- rake (LoadError)
remote:  !     from /tmp/build_b8f358ab/bin/rake:3:in `<main>'
remote:  !
remote: /tmp/codon/tmp/buildpacks/50d5eddf222a9b7326028041d4e6509f915ccf2c/lib/language_pack/helpers/rake_runner.rb:106:in `load_rake_tasks!': Could not detect rake tasks (LanguagePack::Helpers::RakeRunner::CannotLoadRakefileError)
remote: ensure you can run `$ bundle exec rake -P` against your app
remote: and using the production group of your Gemfile.
remote: /tmp/build_b8f358ab/bin/rake:3:in `require': cannot load such file -- rake (LoadError)
remote:     from /tmp/build_b8f358ab/bin/rake:3:in `<main>'

正如您无疑已经发现的那样，上面建议的 bundle exec rake -P 命令适用于本地的任何 Rails.env 设置。我也尝试将 rake 显式添加到 Gemfile 中，但这没有任何区别，预编译 Assets 也没有什么区别。其他注意事项:

• 所有 gem 均成功构建
• 此部署将提示并从 Heroku-18 更新到 Heroku-20 平台；你的吗？
• Rails 5 最新补丁，但还不是 Rails 6
• ruby 2.7.2

我不使用 Spring，所以我的 bin/rake 更简单:

#!/usr/bin/env ruby
require_relative '../config/boot'
require 'rake'
Rake.application.run

...与更复杂的代码一样，肯定是 require 'rake' 失败了。

解决方案

我不能相信 - 这是这个答案:

• https://stackoverflow.com/a/65604896

...解决了这个问题，只需从 2.1.2 更改为 2.1.4。复制粘贴上述解决方案 - 这不是我的工作，功劳属于上面的OP:

gem uninstall bundler
gem install bundler --version '2.1.4' # If this doesn't work - see below

rm Gemfile.lock
bundle install

git add Gemfile.lock
git commit -m "Downgrade Bundler to match current Heroku version, so that deployments succeed"
git push heroku

这已经解决了我的问题。看起来是一个完全奇怪的解决方案，但就是这样。

如果您似乎无法降级 Bundler

在对此答案的评论中，OP 指出:

Because Bundler version 2.2.10 was installed for me as the "default" I hadnt realised Gem bundler-2.1.4 cannot be uninstalled via gem uninstall bundler Using the cleanup_bundler script documented here enabled me to downgrade to v2.1.4 properly. This then did fix the rake problem.

$ gem uninstall bundler
=> Gem bundler-2.2.10 cannot be uninstalled because it is a default gem

StackOverflow 更喜欢内联答案，而不是外部链接，因为外部链接可能会损坏，因此再次指出，功劳归于上面链接的文章:

From all the references I can find, the only way to remove it is to delete the bundler-2.1.4.gemspec file from the gem path. The following commands did the trick for me [...] I wrote a script for you:

#!/usr/bin/env ruby

gempaths = `gem env gempath`.split(":")
gempaths.each do |gempath|
  # lookup bundler-*.gemspec files and delete them
  # this is the only way to completely cleanup default bundler
  # Note: the bundler gemspecs' paths are different for CRuby and JRuby
  Dir.glob(gempath.strip + "/specifications/**/bundler-*.gemspec").each { |p| File.delete(p) }
end

# Remember to make this file executable

...所以希望如果您将其保存为 .rb 文件在方便的地方，chmod u+x foo.rb 和 ./foo.rb - 这可能会解决问题。