Re: [Rails] How to recursively count threads belonging to a chain of forums

On 11 September 2011 23:10, David Roy <lists@ruby-forum.com> wrote:
> Hi I am trying to count all the threads that belong to a forum right
> though the chain.
>
> class Forum::Forum < ActiveRecord::Base
>  belongs_to :parent_forum, :class_name => "Forum"
>  has_many :sub_forums, :class_name => "Forum", :foreign_key =>
> :parent_id
>  has_many :threads
>
  def count_threads
   sub_forums.inject(threads.count) { |memo, sub_forum| memo +=
sub_forum.count_threads }
 end
> end

That should recurse through all the sub-forums... make sure you don't
nest an upper forum in one of the children because you'll get a stack
overflow :-)

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