在另一个导轨引擎中安装导轨引擎

Question

我有一个应用程序正在使用comfortable mexican sofa（舒适）的导轨。我想安装mercury-rails到舒适。原因是我可以修改舒适的水银工作。

我首先将gem引擎添加到了舒适的gemspec中。

s.add_dependency 'mercury-rails' 

跑bundle install

然后继续引导到安装，运行：

rails generate mercury:install 

这给了我一个错误：

[WARNING] Could not load generator "generators/mercury/install/install_generator". Error: uninitialized constant Mercury::Engine. 
/Users/DickieBoy/.rvm/gems/ruby-2.0.0-p247/gems/mercury-rails-0.3.1/lib/generators/mercury/install/install_generator.rb:4:in `<class:InstallGenerator>' 
/Users/DickieBoy/.rvm/gems/ruby-2.0.0-p247/gems/mercury-rails-0.3.1/lib/generators/mercury/install/install_generator.rb:3:in `<module:Generators>' 
/Users/DickieBoy/.rvm/gems/ruby-2.0.0-p247/gems/mercury-rails-0.3.1/lib/generators/mercury/install/install_generator.rb:2:in `<module:Mercury>' 
/Users/DickieBoy/.rvm/gems/ruby-2.0.0-p247/gems/mercury-rails-0.3.1/lib/generators/mercury/install/install_generator.rb:1:in `<top (required)>' 
/Users/DickieBoy/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.1/lib/rails/generators.rb:280:in `block (2 levels) in lookup' 
/Users/DickieBoy/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.1/lib/rails/generators.rb:276:in `each' 
/Users/DickieBoy/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.1/lib/rails/generators.rb:276:in `block in lookup' 
/Users/DickieBoy/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.1/lib/rails/generators.rb:275:in `each' 
/Users/DickieBoy/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.1/lib/rails/generators.rb:275:in `lookup' 
/Users/DickieBoy/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.1/lib/rails/generators.rb:137:in `find_by_namespace' 
/Users/DickieBoy/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.1/lib/rails/generators.rb:154:in `invoke' 
/Users/DickieBoy/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.1/lib/rails/commands/generate.rb:11:in `<top (required)>' 
/Users/DickieBoy/.rvm/gems/ruby-2.0.0-p247/gems/railties-4.0.1/lib/rails/commands.rb:48:in `<top (required)>' 
bin/rails:4:in `require' 
bin/rails:4:in `<main>' 

现在，我想这是因为我m试图安装在引擎上而不是应用程序。我猜引擎没有设计做。 如果我尝试从应用程序中运行相同的命令，也会出现此错误。

注意这项工作时，我将宝石添加到标准的导轨应用程序。

我的问题是：

是否有在发动机内安装发动机的任何标准/文档？

如果没有，我该如何去做这件事？

Answer 1

确保您的图书馆也在这里定义：https://github.com/comfy/comfortable-mexican-sofa/blob/master/lib/comfortable_mexican_sofa/engine.rb