Ruby on rails 什么是正确的（现代）方式来要求一个宝石在另一个宝石？

我最近刚开始写我自己的珍宝。其中一个需要gnuplot gem，如下所示：

module Rocker
  require "gnuplot"
  # ... module code here ...
end

在我将gem添加到我的一个Rails项目的config/environment.rb之前，它工作得非常好。然后，将不会加载任何页面。我会遇到如下错误：

MatriceShow中的类型错误

显示 app/views/matrices/_detail.html.erb 第13行出现时：

无法复制类

追踪还在继续，但毫无用处。我很清楚，gnuplot正在制造某种冲突

gems是否有与config/environment.rb等效的配置？我知道你不应该再在宝石里要求rubygems了。什么是使我的定制宝石可用的正确方法

是的，我想我可以在Rails应用程序中添加gnuplot作为依赖项，但是我的gem不会通过单元测试

已请求完整跟踪。首先，我使用的是acts_as_可注释插件，当需要gnuplot时，会出现一个错误：

$ script/server
=> Booting WEBrick
=> Rails 2.3.5 application starting on http://0.0.0.0:3002
/home/jwoods/NetBeansProjects/crossval/vendor/rails/activerecord/lib/active_record/base.rb:1959:in `method_missing': undefined local variable or method `acts_as_commentable' for #<Class:0xb6889710> (NameError)
    from /home/jwoods/NetBeansProjects/crossval/app/models/matrix.rb:98
    from /usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
    from /usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `require'
    from /home/jwoods/NetBeansProjects/crossval/vendor/rails/activesupport/lib/active_support/dependencies.rb:156:in `require'
    from /home/jwoods/NetBeansProjects/crossval/vendor/rails/activesupport/lib/active_support/dependencies.rb:521:in `new_constants_in'
    from /home/jwoods/NetBeansProjects/crossval/vendor/rails/activesupport/lib/active_support/dependencies.rb:156:in `require'
    from /usr/lib/ruby/1.8/gnuplot.rb:6
    from /usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
    from /usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `require'
    from /home/jwoods/NetBeansProjects/crossval/vendor/rails/activesupport/lib/active_support/dependencies.rb:156:in `require'
    from /home/jwoods/NetBeansProjects/crossval/vendor/rails/activesupport/lib/active_support/dependencies.rb:521:in `new_constants_in'
    from /home/jwoods/NetBeansProjects/crossval/vendor/rails/activesupport/lib/active_support/dependencies.rb:156:in `require'
    from /var/lib/gems/1.8/gems/rocker-0.1.2/lib/rocker.rb:10
    from /usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
    from /usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `require'
    from /home/jwoods/NetBeansProjects/crossval/vendor/rails/activesupport/lib/active_support/dependencies.rb:156:in `require'
    from /home/jwoods/NetBeansProjects/crossval/vendor/rails/activesupport/lib/active_support/dependencies.rb:521:in `new_constants_in'
    from /home/jwoods/NetBeansProjects/crossval/vendor/rails/activesupport/lib/active_support/dependencies.rb:156:in `require'
    from /home/jwoods/NetBeansProjects/crossval/config/../vendor/rails/railties/lib/rails/gem_dependency.rb:208:in `load'
    from /home/jwoods/NetBeansProjects/crossval/config/../vendor/rails/railties/lib/initializer.rb:307:in `load_gems'
    from /home/jwoods/NetBeansProjects/crossval/config/../vendor/rails/railties/lib/initializer.rb:307:in `each'
    from /home/jwoods/NetBeansProjects/crossval/config/../vendor/rails/railties/lib/initializer.rb:307:in `load_gems'
    from /home/jwoods/NetBeansProjects/crossval/config/../vendor/rails/railties/lib/initializer.rb:164:in `process'
    from /home/jwoods/NetBeansProjects/crossval/config/../vendor/rails/railties/lib/initializer.rb:113:in `send'
    from /home/jwoods/NetBeansProjects/crossval/config/../vendor/rails/railties/lib/initializer.rb:113:in `run'
    from /home/jwoods/NetBeansProjects/crossval/config/environment.rb:9
    from /usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
    from /usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `require'
    from /home/jwoods/NetBeansProjects/crossval/vendor/rails/activesupport/lib/active_support/dependencies.rb:156:in `require'
    from /home/jwoods/NetBeansProjects/crossval/vendor/rails/activesupport/lib/active_support/dependencies.rb:521:in `new_constants_in'
    from /home/jwoods/NetBeansProjects/crossval/vendor/rails/activesupport/lib/active_support/dependencies.rb:156:in `require'
    from /home/jwoods/NetBeansProjects/crossval/vendor/rails/railties/lib/commands/server.rb:84
    from /usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
    from /usr/lib/ruby/1.8/rubygems/custom_require.rb:31:in `require'
    from script/server:11

还有这个：

ActionView::TemplateError (can't dup NilClass) on line #13 of app/views/matrices/_detail.html.erb:
10:     <li class="submatrix_info">Submatrices
11:       <ul>
12:         <% matrix.children.each do |child| %>
13:         <li><%= link_to child.id, matrix_path(child), :class => "submatrix_link" %><%= experiments_progress_bar(child) %></li>
14:         <% end %>
15:       </ul>
16:     </li>

    app/helpers/matrices_helper.rb:104:in `experiments_progress_bar'
    app/views/matrices/_detail.html.erb:13
    app/views/matrices/_detail.html.erb:12
    app/views/matrices/show.html.erb:12
    app/controllers/matrices_controller.rb:28:in `show'
    /usr/lib/ruby/1.8/webrick/httpserver.rb:104:in `service'
    /usr/lib/ruby/1.8/webrick/httpserver.rb:65:in `run'
    /usr/lib/ruby/1.8/webrick/server.rb:173:in `start_thread'
    /usr/lib/ruby/1.8/webrick/server.rb:162:in `start'
    /usr/lib/ruby/1.8/webrick/server.rb:162:in `start_thread'
    /usr/lib/ruby/1.8/webrick/server.rb:95:in `start'
    /usr/lib/ruby/1.8/webrick/server.rb:92:in `each'
    /usr/lib/ruby/1.8/webrick/server.rb:92:in `start'
    /usr/lib/ruby/1.8/webrick/server.rb:23:in `start'
    /usr/lib/ruby/1.8/webrick/server.rb:82:in `start'

Rendered rescues/_trace (74.6ms)
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Rendering rescues/layout (internal_server_error)

---

您在gem中将gnuplot指定为依赖项了吗？@jpartogi，我在gem Rakefile中将它指定为依赖项@罗杰德帕克，我已经包括了全部痕迹。

ActionView::TemplateError (can't dup NilClass) on line #13 of app/views/matrices/_detail.html.erb:
10:     <li class="submatrix_info">Submatrices
11:       <ul>
12:         <% matrix.children.each do |child| %>
13:         <li><%= link_to child.id, matrix_path(child), :class => "submatrix_link" %><%= experiments_progress_bar(child) %></li>
14:         <% end %>
15:       </ul>
16:     </li>

    app/helpers/matrices_helper.rb:104:in `experiments_progress_bar'
    app/views/matrices/_detail.html.erb:13
    app/views/matrices/_detail.html.erb:12
    app/views/matrices/show.html.erb:12
    app/controllers/matrices_controller.rb:28:in `show'
    /usr/lib/ruby/1.8/webrick/httpserver.rb:104:in `service'
    /usr/lib/ruby/1.8/webrick/httpserver.rb:65:in `run'
    /usr/lib/ruby/1.8/webrick/server.rb:173:in `start_thread'
    /usr/lib/ruby/1.8/webrick/server.rb:162:in `start'
    /usr/lib/ruby/1.8/webrick/server.rb:162:in `start_thread'
    /usr/lib/ruby/1.8/webrick/server.rb:95:in `start'
    /usr/lib/ruby/1.8/webrick/server.rb:92:in `each'
    /usr/lib/ruby/1.8/webrick/server.rb:92:in `start'
    /usr/lib/ruby/1.8/webrick/server.rb:23:in `start'
    /usr/lib/ruby/1.8/webrick/server.rb:82:in `start'

Rendered rescues/_trace (74.6ms)
Rendered rescues/_request_and_response (0.2ms)
Rendering rescues/layout (internal_server_error)