gistfile1.rb

    types = %w(people companies places events type1 type2 type3 type4 type5 type6)
    positions =* (1..10)
    
    Document.all.each do |document|
      puts 'Document GID: ' + document.gid.to_s
      
      positions.each do |position|
        tagging = Tagging.create do |tagging|
          tagging.document_gid = document.gid
          tagging.type = types.sample
          tagging.zone_id = document.zone_id
          tagging.position = position
        end
        
        puts '  Tagging: ' + tagging.id.to_s
      end
    end

Ну можно было бы и создание документов описать:

100_000.times do |i|
  quietly do
    Document.create(title: "doc#{i}", zone_id: 1)
  end

  puts "created doc#{i}"
end

В populate.rake сделал такое.