code: function( filters, fieldPrefix, selectorWithoutBells ){
      return  {
        querySelector: this._makeMongoConditions( filters.conditions || {}, fieldPrefix, selectorWithoutBells ),
        sortHash:  this._makeMongoSortHash( filters.sort || {}, fieldPrefix )
      };
    }
docs: Make parameters for queries. It's the equivalent of what would be an SQL creator for a SQL layer