old_contents: var mongoose     = require('mongoose');
  var Schema       = mongoose.Schema;
  
  var RestaurantSchema   = new Schema({
      name: String
  });
  
  module.exports = mongoose.model('Restaurant', RestaurantSchema);
  
new_contents: var mongoose     = require('mongoose');
  var Schema       = mongoose.Schema;
  
  var RestaurantSchema   = new Schema({
      name: String,
      votes: Number
  });
  
  module.exports = mongoose.model('Restaurant', RestaurantSchema);
  
subject: add votes attribute to restaurant schema