categorysnippet.rb

class Category < ActiveRecord::Base
  has_many :topics, :order => "name ASC"
  has_many :entries, :through => :topics


  # Public: Return an Array of categories with included topics
  # and entries as hash values.
  #
  # search_results - An array of entries
  #
  # Returns a list of Categories
  def self.categories_for_search_result(search_results)
    topics = topics_for_entries(search_results)
    categories = categories_for_topics(search_results)

    result = []

    categories.each do |category|
        topics.each do |topic|
          if topic.category_id == category.id
            search_results_array = Array.new

            search_results.each do |entry|
              if entry.topic_id == topic.id
                search_results_array.push(entry)
              end
            end

            @topic_hash = {topic => search_results_array}
          end
        end
        categories_hash = {category => @topic_hash}
        result.push(categories_hash)
    end

    return result
  end

  private

  def self.topics_for_entries(entries)
      topics = Array.new
        entries.each { |entry| topics.push(entry.topic) }
          return topics.uniq
  end

  def self.categories_for_topics(topics)
      categories = Array.new
        topics.each { |topic| categories.push(topic.category) }
          return categories.uniq
  end

end