return true if option.conditions.blank?
    conditional_string = option.conditions
    variable_array = option.conditions.split(/[!&(),]/)
    variable_array = variable_array.find{|variable| !variable.blank?}
    unless variable_array.blank?
      variable_array.each do |variable|
        included = listing.options.split(',').include?(variable)
        conditional_string.gsub!(variable, included.to_s)
      end
    end
    conditional_string.gsub!('&', '&&').gsub!(',', '||')
    eval(conditional_string)