text: const mongoose = require('mongoose');
  const bluebird = require('bluebird');
  
  const MONGODB_URI = process.env.MONGODB_URI;
  const DB_HOST = process.env.MONGODB_HOST || 'mongo_db';
  const DB_PORT = process.env.MONGODB_PORT || '27017';
  mongoose.connect(MONGODB_URI || `mongodb://${DB_HOST}:${DB_PORT}/county-data`);
  mongoose.Promise = bluebird;
  
  module.exports = mongoose;
  