counter cache dsl

caching_dsl

  cache_for :invitiations do |invitation|
    invitation(:new) do |action|
      action.increase(:create)
      action.decrease(:update, :not => :to_pending?)
    end
    invitation(:accepted) do |action|
      action.increase(:to_accepted?)
      action.decrease(:update, :not => :to_accepted?)
    end
    invitation(:rejected) do |action|
      action.increase(:update, :to_rejected?)
      action.decrease(:not => :to_rejected?)
    end
  end