method

def self.insert_samples str
  re = /(?<=\[@)(\d+)(?=\])/
  samples = Hash.new

  self.find(str.scan(re).map { |a| a.join }).map do |obj|
    samples[obj.id.to_s] = obj
  end

  while num = str[re]
    str.sub!("[@#{num}]", samples[num].script)
  end

  str
rescue ActiveRecord::RecordNotFound => e
  Rails.logger.error e.to_s
  return nil
end