Sunspot.setup(BlogPost) do
  Topic.solr.each do |t|
    float "influence_#{t}".to_sym do
      if user
        is = scores_by_name[t.name]
        is.nil? ? 0.0 : is.score
      else
        nil
      end
    end
  end
end

class BlogPost < ActiveRecord::Base
  include ActiveSupport::Memoizable

  private

  def scores_by_name
    scores_by_name = {}
    user.scores.active.percentile.each { |score| scores_by_name[score.name] = score }
    scores_by_name
  end
  memoize :scores_by_name
end