Rails - May 2008 - Counter cache

class Category
  has_many :clips
end

class Clip
  belongs_to :category, :counter_cache = > true

  named_scope :converted, :conditions => {:converted => true}
end

1. How to update counters if clip changes its category_id ?
2. How to implement custom counters by conditions, e.g:

category.clips_count
category.converted_clips_count
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