I would think that the find code in your PostsController is something like
@post = Post.find(params[:id])
This of course directly gets the Post with the id specified in the URL.
What you can do to get around it is to drilldown from the Forum, Topic
and then Post. Something like this:
@forum = Forum.find(params[:forum_id], :include => { :topics => :posts } )
@topic = @forum.topics.select { |topic| topic.id ==
params[:topic_id].to_i }.first
@post = @topic.posts.select { |post| post.id == params[:id].to_i }.first
Please note that the code above is not robust as it does not check for nils.
If @topic were nil for example, the last line to get the post will bomb out.
/franz
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