Routing problem in rails - ruby-on-rails

Question

// see below for update
Error:
No route matches {:controller=>"conversations", :action=>"reply", :id=>nil, :board_id=>nil}
Parameters dump:
{"board_id"=>"2",
"id"=>"3"}
Log:
Started GET "/boards/2/conversations/3/reply" for 127.0.0.1 at Mon Apr 04 23:40:59 +0200 2011
Processing by ConversationsController#reply as HTML
Parameters: {"board_id"=>"2", "id"=>"3"}
Board Load (0.1ms) SELECT "boards"."id" FROM "boards" WHERE ("boards"."id" = 2) LIMIT 1
Board Load (0.6ms) SELECT "boards".* FROM "boards" WHERE ("boards"."id" = 2) LIMIT 1
Rendered conversations/_reply_form.html.erb (1.3ms)
Rendered conversations/reply.html.erb within layouts/application (9.4ms)
Completed in 30ms
ActionView::Template::Error (No route matches {:controller=>"conversations", :action=>"reply", :id=>nil, :board_id=>nil}):
1: <%= form_for(#comment, :url => reply_board_conversation_url(:board_id=>#board_id, :id=>#conversation_id)) do |f| %>
2: <% if #comment.errors.any? %>
3: <div id="error_explanation">
4: <h2><%= pluralize(#comment.errors.count, "error") %> prohibited this reply from being saved:</h2>
app/views/conversations/_reply_form.html.erb:1:in `_app_views_conversations__reply_form_html_erb__999049254_2171331720_2303070'
app/views/conversations/reply.html.erb:4:in `_app_views_conversations_reply_html_erb___838091718_2171408600_0'
Rendered /opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.0/lib/action_dispatch/middleware/templates/rescues/_trace.erb (1.1ms)
Rendered /opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.0/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (982.1ms)
Rendered /opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.0/lib/action_dispatch/middleware/templates/rescues/template_error.erb within rescues/layout (1001.7ms)
In my routes.rb, its:
get '/boards/:board_id/conversations/:id/reply' => "conversations#reply", :as => :reply_board_conversation
post '/boards/:board_id/conversations/:id/reply' => "conversations#save_reply", :as => :reply_board_conversation
resources :boards do
resources :conversations
end
Does anyone know what I'm doing wrong? Thanks in advance!
// Update:
Figured out the params. But, now we have a new error.. see output:
Started GET "/boards/2/conversations/3/reply" for 127.0.0.1 at Tue Apr 05 11:29:52 +0200 2011
Processing by ConversationsController#reply as HTML
Parameters: {"board_id"=>"2", "conversation_id"=>"3"}
Board Load (0.2ms) SELECT "boards"."id" FROM "boards" WHERE ("boards"."id" = 2) LIMIT 1
Board Load (0.2ms) SELECT "boards".* FROM "boards" WHERE ("boards"."id" = 2) LIMIT 1
Rendered conversations/_reply_form.html.erb (4.3ms)
Rendered conversations/reply.html.erb within layouts/application (6.3ms)
Completed in 26ms
ActionView::Template::Error (undefined method `model_name' for NilClass:Class):
1: <%= form_for(#comment, :url => reply_board_conversation_url(:board_id=>#board.id, :id=>#conversation_id)) do |f| %>
2: <% if #comment.errors.any? %>
3: <div id="error_explanation">
4: <h2><%= pluralize(#comment.errors.count, "error") %> prohibited this reply from being saved:</h2>
app/views/conversations/_reply_form.html.erb:1:in `_app_views_conversations__reply_form_html_erb__999049254_2174448800_2303070'
app/views/conversations/reply.html.erb:1:in `_app_views_conversations_reply_html_erb___838091718_2174498080_0'
Rendered /opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.0/lib/action_dispatch/middleware/templates/rescues/_trace.erb (1.1ms)
Rendered /opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.0/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (757.4ms)
Rendered /opt/local/lib/ruby/gems/1.8/gems/actionpack-3.0.0/lib/action_dispatch/middleware/templates/rescues/template_error.erb within rescues/layout (774.2ms)

Answer 1

The log you provided indicates the #board_id and #conversation_id variables are nil.
Make sure you are actually setting the value of #board_id and #conversation_id in ConversationsController's reply action. I suspect you are either populating board_id or forgetting to do something like #board_id = params[:board_id] altogether.
Update
To answer the next part of your question, I am guessing that #comment has not been instantiated. Somewhere in your controller action you should do something like the following:
#comment = Comment.new(params[:comment]
This should create a comment from any existing form data, or a new comment if there isn't any form data.

Answer 2

Your #board_id and #conversation_id variables are both nil, as it says in the error message:
No route matches {:controller=>"conversations",
:action=>"reply",
:id=>nil,
:board_id=>nil
}
Note the :id and :board_id parameters here.