old_contents: module.exports = function(conf) {
    var log      = this.logger.getLogger('app.db');
    var cyan     = this.utils.chalk.cyan;
    var red      = this.utils.chalk.red;
    var resolve  = this.utils.path.resolve;
    var mongoose;
  
    try {
      mongoose = require(resolve(this.base, 'node_modules', 'mongoose'));
    } catch(e) {
      log.error(red('Install mongoose with \'npm install --save mongoose\''));
      throw e;
    }
  
  
    //
    // Formats a mongodb connection string from the db object.
    //
    function getURL(db) {
      return [
        'mongodb://',
        db.serverConfig.host,
        ':',
        db.serverConfig.port,
        '/',
        db.databaseName
      ].join('');
    }
  
    //
    // Constructor
    //
    var MongoDB = function(url, options) {
      // Connect and store connection
      this.db    = mongoose.createConnection(url, options || {});
  
      // Bind model() for easy access
      this.model = this.db.model.bind(this.db);
  
      // Event: Connected
      this.db.on('open', function() {
        this.url = getURL(this.db);
        log.info('Connected to MongoDB: %s', cyan(this.url));
      });
  
      // Event: Disconnected
      this.db.on('close', function() {
        log.warn('Disconnected from MongoDB: %s', cyan(this.url));
      });
  
      // Event: Error
      this.db.on('error', function(err) {
        log.error(err);
      });
    };
  
    MongoDB.prototype.log    = log;
    MongoDB.prototype.Schema = mongoose.Schema;
    MongoDB.prototype.Types  = mongoose.Types;
    MongoDB.prototype.mongo  = mongoose.mongo;
  
    return new MongoDB(conf.url, conf.options);
  };
  
new_contents: module.exports = function(conf) {
    var log      = this.log;
    var cyan     = this.utils.chalk.cyan;
    var red      = this.utils.chalk.red;
    var resolve  = this.utils.path.resolve;
    var mongoose;
  
    try {
      mongoose = require(resolve(this.base, 'node_modules', 'mongoose'));
    } catch(e) {
      log.error(red('Install mongoose with \'npm install --save mongoose\''));
      throw e;
    }
  
  
    //
    // Formats a mongodb connection string from the db object.
    //
    function getURL(db) {
      return [
        'mongodb://',
        db.serverConfig.host,
        ':',
        db.serverConfig.port,
        '/',
        db.databaseName
      ].join('');
    }
  
    //
    // Constructor
    //
    var MongoDB = function(url, options) {
      // Connect and store connection
      this.db    = mongoose.createConnection(url, options || {});
  
      // Bind model() for easy access
      this.model = this.db.model.bind(this.db);
  
      // Event: Connected
      this.db.on('open', function() {
        this.url = getURL(this.db);
        log.info('Connected to MongoDB: %s', cyan(this.url));
      });
  
      // Event: Disconnected
      this.db.on('close', function() {
        log.warn('Disconnected from MongoDB: %s', cyan(this.url));
      });
  
      // Event: Error
      this.db.on('error', function(err) {
        log.error(err);
      });
    };
  
    MongoDB.prototype.log    = log;
    MongoDB.prototype.Schema = mongoose.Schema;
    MongoDB.prototype.Types  = mongoose.Types;
    MongoDB.prototype.mongo  = mongoose.mongo;
  
    return new MongoDB(conf.url, conf.options);
  };
  
subject: Use default logger