Rails - Jan 2011 - Rails 3 - Helping with a Commenting Module

class CommentsController < ApplicationController

          def create

            @commentable= context_object()
        @comment @commentable.comments.build(params[:comment].merge(:user_id
=>
current_user.id))

        if @comment.save
          respond_to do |format|
           format.js
          end
        else
          render :action => ''new''
        end
      end

      private

      def context_object
        params[:constraint]
[:context_type].singularize.classify.constantize.find( context_id )
      end

      def context_id
        params["#{ params[:constraint][:context_type].singularize }
_id"]
      end

    end


This commenting module has served me well but I ran into a hitch this
morning, possibly because of my use of nested resources. Essentially,
I now have a URL like:

    /projects/3/albums/6/attachments/84

When I comment on that page, I get the error:

    ActiveRecord::RecordNotFound (Couldn''t find Project without an
ID):
      app/controllers/comments_controller.rb:102:in `context_object''
      app/controllers/comments_controller.rb:14:in `create''


My routes file looks like:

  resources :projects do
    resources : albums do
      resources :attachments
    end
  end


    resources :attachments do
        resources :comments, :only =>
[:create, :update,:destroy], :constraint => {:context_type =>
"conversations"}
    end


Any ideas on how I can get the commenting module to play nicely with
commenting on `project>Album>Attachment ?`


Thanks for the input,

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