自 Rails3 升级以来对空 params[] 哈希进行故障排除 [英] Troubleshooting empty params[] hash since Rails3 Upgrade

问题描述

我有一个命名路由，可以在控制台中正确测试并显示应该包含在 params[] 中的 :url_title，但 params[] 始终为空.

I have a named route that tests properly in the console and shows the :url_title which should be included in params[], yet params[] is always empty.

问题是，为什么 params[] 是空的?我的期望是它应该有 params[:url_title].

The question is, why is params[] empty? My expectation is it should have params[:url_title].

我也删除了这条路由并使用了默认资源，params[] 仍然是空的.

I also removed this route and used the default resource and params[] is still empty.

我一直在使用记录器检查参数.

I've been checking params by using logger.

我的应用是从 Rails 2.3.5 升级到 Rails 3.0.3.

My app is an upgrade from Rails 2.3.5 to Rails 3.0.3.

这是正在发生的事情的代码摘要.

Here's a code summary of what's going on.

# this is my route
match 'papers/:url_title' => 'papers#show', :as => :permalinkpaper

# this is link_to and the generated url being called
<%= link_to paper.title, paper_path(paper.url_title) %>
http://localhost:3000/papers/great-passion

# which properly matches to this controller#action for papers#show 
def show
    @paper = Paper.where(:url_title => params[:url_title]).first()
    PaperHistory.add( current_user, @paper.id )

    respond_to do |format|
      format.html # show.html.erb
      format.xml  { render :xml => @paper }
      format.json { render :json => @paper }
      format.mobile # { render :layout => false }
    end
  end

# which generals this error because the Paper looking returns noting because the params[:url_title] is nil
Called id for nil, which would mistakenly be 4 -- if you really wanted the id of nil, use object_id

# the log stack trace
Started GET "/papers/great-passion" for 127.0.0.1 at Mon Jan 24 23:04:04 -0600 2011
  Processing by PapersController#show as HTML

  SQL (0.7ms)  SHOW TABLES
  SQL (0.5ms)  SHOW TABLES
  Paper Load (0.7ms)  SELECT `papers`.* FROM `papers` WHERE (`papers`.`url_title` IS NULL) ORDER BY title LIMIT 1
Completed   in 119ms

RuntimeError (Called id for nil, which would mistakenly be 4 -- if you really wanted the id of nil, use object_id):
  app/controllers/papers_controller.rb:43:in `show'



# I've validated the route in the console and it seems to know :url_title is the proper value
>> r = ActionController::Routing::Routes
>> r.recognize_path "/papers/great-passion"
=> {:action=>"show", :url_title=>"great-passion", :controller=>"papers"} 

更新:我发现当 URL 中有值时，params[] 不为空，例如在执行搜索时.

UPDATE: I have found that params[] are NOT empty when values are in the URL, such as when performing a search.

http://localhost:3000/papers?utf8=%E2%9C%93&keywords=passion

这样就成功了

Started GET "/papers?utf8=%E2%9C%93&keywords=passion" for 127.0.0.1 at Tue Jan 25 00:20:07 -0600 2011
  Processing by PapersController#index as HTML
  Parameters: {"utf8"=>"✓", "keywords"=>"passion"}
params: utf8✓keywordspassion

推荐答案

感谢大家的帮助.我能够一块一块地反汇编我的应用程序，最后让 params[] 显示出来.

Thanks to all for the help. I was able to disassemble my app piece by piece and finally get params[] to show up.

罪魁祸首是open_id_authentication插件.

我在供应商目录中有一些插件，所以我将它们全部删除，在克服了一些由此产生的错误(b/c 插件现在丢失)后，一切正常.我系统地更换了插件，到了open_id_authentication的时候发现params[]又消失了.

I had some plugins in the vendors directory, so I removed them all and after hurdling a few resulting errors (b/c the plugins were now missing) everything worked. I systematically replaced plugins, and when I got to open_id_authentication found that the params[] again disappeared.

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