Question

在我的rails3引擎gemfile中，我添加了：

gem 'paperclip'
gem 'inherited_resources'

我还将此添加到我的gemspec：

s.add_dependency "paperclip"
s.add_dependency "inherited_resources"

然后我为我的引擎和客户端应用程序运行了bundle install并启动了客户端应用程序的控制台，以便首先测试回形针，我得到了：

Using /Users/ynkr/.rvm/gems/ruby-1.9.2-p180 with gemset rails31beta
ynkr % rails c
/Users/ynkr/.rvm/gems/ruby-1.9.2-p180@rails31beta/gems/actionpack-3.1.0.rc4/lib/action_dispatch/http/mime_type.rb:101: warning: already initialized constant YML
Loading development environment (Rails 3.1.0.rc4)
ruby-1.9.2-p180 :001 > b=Blog::Blog.first 
  Blog::Blog Load (0.2ms)  SELECT `blogs`.* FROM `blogs` LIMIT 1
 => #<Blog::Blog id: 1, user_id: 1, context_id: 2, title: "Cmd Line Blog Title", title_for_url: "cmd-line-blog-title", teaser: "This is the teaser for the command line blog", content: "Some content for the cmd line blog", created_at: "2011-06-28 06:06:55", updated_at: "2011-06-28 06:06:55"> 
ruby-1.9.2-p180 :002 > b.photos
NoMethodError: undefined method `has_attached_file' for #<Class:0x00000102a57fc8>
    from /Users/ynkr/.rvm/gems/ruby-1.9.2-p180@rails31beta/gems/activerecord-3.1.0.rc4/lib/active_record/base.rb:1078:in `method_missing'
    from /websites/gems/blog/app/models/blog/photo.rb:6:in `<class:Photo>'
    from /websites/gems/blog/app/models/blog/photo.rb:1:in `<top (required)>'
    from /Users/ynkr/.rvm/gems/ruby-1.9.2-p180@rails31beta/gems/activesupport-3.1.0.rc4/lib/active_support/dependencies.rb:452:in `load'

好的，所以看起来找不到paperclip gem中的has_attached_file方法。为什么？我不确定。

转到inherited_resources，我改变了一个脚手架生成的控制器，如下所示：

class Blog::ContextsController < InheritedResources::Base
  before_filter :redirect_unless_admin
end

并使用以下命令加载我所欢迎的索引页面（在日志中）：

Started GET "/blog/contexts" for 127.0.0.1 at 2011-06-28 12:06:25 -0700

ActionController::RoutingError (uninitialized constant InheritedResources):

Rendered /Users/ynkr/.rvm/gems/ruby-1.9.2-p180@rails31beta/gems/actionpack-3.1.0.rc4/lib/action_dispatch/middleware/templates/rescues/routing_error.erb within rescues/layout (0.5ms)

我的问题是为什么这些不起作用？我的预感是有一些关于引擎，命名空间和装载宝石的东西，我完全不知道。

Answer 1

您需要在初始化程序文件中要求引擎中的每个gem，例如。 lib/<your_engine_name>/engine.rb

这里有更多的解释......

Rails Engine - Gems dependencies, how to load them into the application?

Rails3引擎：未加载Gems（paperclip和inherited_resources）

1 个答案: