code: function preSave(next) {
  		const _ref = this.get(options.createdName);
  
  		if (!options.disableUpdated) {
  			this[options.updatedName] = new Date();
  		}
  		if (!options.disableCreated && (_ref === undefined || _ref === null)) {
  			this[options.createdName] = new Date();
  		}
  
  		next();
  	}
docs: Callback for the schema pre save
  
  @this mongoose.Schema
  @param {Function} next The next pre save callback in chain
  @returns {undefined}