Ruby 1.8.7中的NoMethodError

Question

我开始研究名为Shapado（http://shapado.com）的应用程序，该应用程序在后台使用mongo数据库在Ruby上运行。当我尝试添加一些数据到数据库时，我得到以下错误。我附上了所有我认为可能成为源代码的相关文件。在QuestionsController.rb

错误

Processing QuestionsController#tags_for_autocomplete to js (for 93.97.246.67 at 2011-03-31 10:02:00) [GET] 
    Parameters: {"tag"=>"backup"} 

NoMethodError (undefined method `find_tags' for #<Array:0x7f24f1032448>): 
    /var/lib/gems/1.8/gems/mongo_mapper-0.8.6/lib/mongo_mapper/plugins/associations/proxy.rb:109:in `send' 
    /var/lib/gems/1.8/gems/mongo_mapper-0.8.6/lib/mongo_mapper/plugins/associations/proxy.rb:109:in `method_missing' 
    /var/lib/gems/1.8/gems/mongo_mapper-0.8.6/lib/mongo_mapper/plugins/dynamic_querying.rb:37:in `method_missing' 
    /var/lib/gems/1.8/gems/mongo_mapper-0.8.6/lib/mongo_mapper/plugins/associations/many_documents_proxy.rb:76:in `method_missing' 
    app/controllers/questions_controller.rb:184:in `tags_for_autocomplete' 
    app/controllers/questions_controller.rb:180:in `tags_for_autocomplete' 
    compass (0.10.5) lib/compass/app_integration/rails/actionpack2/action_controller.rb:7:in `process' 
    warden (1.0.3) lib/warden/manager.rb:35:in `call' 
    warden (1.0.3) lib/warden/manager.rb:35:in `call' 
    warden (1.0.3) lib/warden/manager.rb:34:in `catch' 
    warden (1.0.3) lib/warden/manager.rb:34:in `call' 
    haml (3.0.25) lib/sass/plugin/rack.rb:41:in `call' 
    /var/lib/gems/1.8/gems/mongomapper_ext-0.5.0/lib/mongomapper_ext/file_server.rb:17:in `call' 
    app/middlewares/dynamic_domain.rb:17:in `call' 
    app/middlewares/mongo_mapper_middleware.rb:24:in `call' 
    /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' 

tags_for_autocomplete方法

def tags_for_autocomplete 
    respond_to do |format| 
     format.js do 
     result = [] 
     if q = params[:tag] 
      result = current_group.questions.find_tags(/^#{Regexp.escape(q.downcase)}/i, 
             :group_id => current_group.id,  
             :banned => false) 
     end  
     results = result.map do |t| 
      {:caption => "#{t["name"]} (#{t["count"].to_i})", :value => t["name"]}  
     end 
     # if no results, show default tags 
     if results.empty? 
      results = current_group.default_tags.map {|tag|{:value=> tag, :caption => tag}} 
     end 
     render :json => results 
     end 
    end 

/var/lib/gems/1.8/gems/mongo_mapper-0.8.6/lib/ mongo_mapper/plugins/associations/proxy.rb：109

protected 
    def method_missing(method, *args, &block) 
    if load_target 
     target.send(method, *args, &block) 
    end 
    end 

Answer 1

将“current_group.questions.find_tags”替换为代码中2个位置中的“Question.find_tags”。

如此地： http://shapado.com/questions/what-is-the-cause-of-the-nomethoderror-when-using-the-search-box-on-the-tags-page

这似乎为我工作。