gistfile1.rb

# Given a set of documents this method returns a list of tags associated with
# ordered by the ones occuring on the most documents. Tags that only appear o
# If the user supplies a specific tag to exclude it will not be included in t
def self.related_tags(docs,exclude = nil)
  related = {}
  
  docs.each_with_index do |doc, i|
    break if i >= 20 # only consider the first 10 docs
    doc.word_tags.each do |tag| # count num times each tag occurs
      next if exclude && tag.name == exclude # if caller specified a tag to e
      related[tag] ||= 0
      related[tag] += 1
    end
  end
  
  related = related.sort { |a,b| a[1]<=>b[1] }.reverse[0..24]
  # now related is an array of arrays [tag,count] ordered by count
  related = related.collect { |tag| tag[0] if tag[1] > 1 }.compact
end