我刚刚检查了我的Rails Engine项目,当(在捆绑安装后)我在其根目录中调用了rails -v,我收到一个LoadError,Rails似乎正在寻找宝石/引擎,试图建立：
my-engine dmoles$rails -v
/Users/dmoles/.rvm/rubies/ruby-2.2.1/lib/ruby/site_ruby/2.2.0/rubygems/dependency.rb:315:in `to_specs': Could not find 'my-engine' (>= 0) among 117 total gem(s) (Gem::LoadError)
Checked in 'GEM_PATH=/Users/dmoles/.rvm/gems/ruby-2.2.1:/Users/dmoles/.rvm/gems/ruby-2.2.1@global',execute `gem env` for more information
from /Users/dmoles/.rvm/rubies/ruby-2.2.1/lib/ruby/site_ruby/2.2.0/rubygems/dependency.rb:324:in `to_spec'
from /Users/dmoles/.rvm/rubies/ruby-2.2.1/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_gem.rb:64:in `gem'
from /Users/dmoles/.rvm/gems/ruby-2.2.1/bin/rails:22:in `<main>'
运行gem env如建议不再有启发：
my-engine dmoles$gem env
RubyGems Environment:
- RUBYGEMS VERSION: 2.4.6
- RUBY VERSION: 2.2.1 (2015-02-26 patchlevel 85) [x86_64-darwin14]
- INSTALLATION DIRECTORY: /Users/dmoles/.rvm/gems/ruby-2.2.1
- RUBY EXECUTABLE: /Users/dmoles/.rvm/rubies/ruby-2.2.1/bin/ruby
- EXECUTABLE DIRECTORY: /Users/dmoles/.rvm/gems/ruby-2.2.1/bin
- SPEC CACHE DIRECTORY: /Users/dmoles/.gem/specs
- SYSTEM CONFIGURATION DIRECTORY: /Users/dmoles/.rvm/rubies/ruby-2.2.1/etc
- RUBYGEMS PLATFORMS:
- ruby
- x86_64-darwin-14
- GEM PATHS:
- /Users/dmoles/.rvm/gems/ruby-2.2.1
- /Users/dmoles/.rvm/gems/ruby-2.2.1@global
- GEM CONFIGURATION:
- :update_sources => true
- :verbose => true
- :backtrace => false
- :bulk_threshold => 1000
- REMOTE SOURCES:
- https://rubygems.org/
- SHELL PATH:
- /Users/dmoles/.rvm/gems/ruby-2.2.1/bin
- /Users/dmoles/.rvm/gems/ruby-2.2.1@global/bin
- /Users/dmoles/.rvm/rubies/ruby-2.2.1/bin
- /Users/dmoles/.rvm/bin
- /Users/dmoles/bin
- /usr/local/bin
- /usr/bin
- /bin
- /usr/sbin
- /sbin
- /usr/local/git/bin
我可以搭建/安装宝石
gem build my-engine.gemspec gem install my-engine-0.0.1.gem
之后,rails -v开始工作.但是,这似乎并不是必须的,而且它使我担心Rails可能正在使用内置/安装的代码而不是直接的源代码.我究竟做错了什么？
就是说,它运行,即使它抱怨“Bundler正在使用为不同的宝石创建的binstub”.可能是因为它不喜欢宝石被命名为我的引擎,但是ENGINE_PATH有我的/引擎？
解决方法
在引擎根目录中调用rails -v是没有意义的,因为引擎是一个gem,所有这些都需要在rails应用程序中加载,除非您将其结构化为普通的rails应用程序而不是引擎gem.
所以基本上,当您运行rails -v时,它将尝试将引擎作为宝石加载,而不是正常的rails应用程序,因此如果引擎没有安装在您的环境中,它将会抱怨.