Hi. I have a problem with counters in Rails. The situation looks like
this:
-3 simple models

class Forum < ActiveRecord::Base
  has_many :posts
end
class Topic < ActiveRecord::Base
  has_many :posts
end
class Post < ActiveRecord::Base
  belongs_to :topic, :counter_cache => true
  belongs_to :forum, :counter_cache => true
end

- In migrations i have declared
  t.column :posts_count, :integer, :default => 0
  for Forum and Topic

- Now a simple action

def some_action
  @post = Post.new(params[:id])

  @forum.posts << @post   # The @forums.posts_count is up by 1
  @topic.posts << @post   # The @topic.posts_count is _not_ up by 1
end

Both, the forum_id and topic_id are set correctly in @post, it saves
into the database and everything else is dandy. But why oh why doesn't
the @topic.posts_count increment ? (oh, obviously if I change the
order
of the two crucial lines the effect will be the same - the instance in
the second line won't get the posts_count incremented)

Could anyone come up with a solution ? (apart from making the counters
'by hand')

--
AdamS