adding get var to generation of a named route

I have an ActiveResource named Discussion. In my views, I often call discussion_path(@discussion) and I'd like to add on the post count (discussion.posts.count) as a get var. I'm want my urls to be like: http://nearbygamers.com/discussions/14?posts=3 so that folks who've read a forum see blue links for discussions that have had posts added to them.

I've tried adding options to the discussion_path call in my views which just blows up with various unhelpful messages (either that "discussion url failed to generate" or a call to nil.to_sym). I've tried writing my own discussion_path helper with similar results. Any suggestions?

I'm having this exact same problem.

I have a route of:

  map.content 'sites/:site_short_name/*file',     :controller => 'sites',     :action => 'content',     :requirements => { :site_short_name => /some_regex/ }

And I try to call

content_url :file => "search"

and it also "blows up" and says:

ActionView::TemplateError: content_url failed to generate from {:action=>"content", :file=>"search", :controller=>"sites"}, expected: {:action=>"content", :controller=>"sites"}, diff: {:file=>"search"}

I've looked into the rails source and this seems to be coming from:

actionpack/lib/action_controller/routing.rb line 1280 ( I have Rails SVN revision REVISION_{2007-02-19}, so it's 1.2-ish ).

The exception seems to be raised from line 1242 in the same file because   path = named_route.generate(options, merged, expire_on) is returning nil...

I'm planning on reading Jamis' article: Under the hood: route generation in Rails [ Buckblog: Under the hood: route generation in Rails ], but I haven't had a chance yet. I'm hoping there might be some help in there.

Nate Murray http://pasadenarb.com/