text: // load the things we need
  var mongoose = require('mongoose');
  
  
  // define the schema for our chat model
  var chatSchema = mongoose.Schema({
      sender    : String,
      recipient : String,
      message   : String
  },
      {
          timestamps: true
      }
  );
  
  // create the model for chats and expose it to our app
  module.exports = mongoose.model('Chat', chatSchema);