Rails - Feb 2008 - habtm and counter_cache

Hi,

I''ve a set of two models in habtm relationship. However,
since :counter_cache can only be used on belongs_to method, how can I
implement the counter cache on habtm models?

I have tried with after_add and after_remove callbacks, but I don''t
know quite how to code the method for updating.

I created this method:

  def update_count
    self.posts_count = self.posts.length
  end

into:

  class Category < ActiveRecord::Base
    has_and_belongs_to_many :posts,
                            :after_add => :update_count,
                            :after_remove => :update_count
  end

However, the method doesn''t work (or I wouldn''t be posting
here, would
I?)... I would appreciate any help, or maybe a tip on where to find
relevant information.

Thanks.


Branko
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Solved it a bit differently. :)

D''oh! after_create in Post model was the correct answer...

I''ve documented it for people who might be looking for this.

http://eyedeal.team88.org/node/104
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