Rails - Jun 2006 - Activerecord Update syntax.

This what I have - sadly, it does not work :( .

posts = {params[:topic][:forum_id] => { "posts_count" =>
"posts_count +
@topic.posts_count"}, @topic.forum_id => { "posts_count" =>
"posts_count
- @topic.posts_count" } }

Forum.update(posts.keys, posts.values)

It''s suppose to subtract the posts_count from topic, and add it and
subtract it from posts_count from each board, respectively.

I am fairly sure that "posts_count - @topic.posts_count" is
what''s
stopping it from working and was wondering how would i go about this
better? Or if anyone can suggest an entirely better way to do this
transaction that would also be appreciated.

Thanks in advance!

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Anyone have an ideas?

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eddy wrote:
> Anyone have an ideas?
First of all, your setting the values in the hash to a string.  No 
actual caclulations will happen here.  You probably want something more 
like this that uses update_attributes which accepts a hash of values.

  topic = Topic.find(params[:id])
  topic.post_count = #some calulation here.
  topic.update_attributes(params[:topic])

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