text: var _ = require('lodash');
  
  module.exports = {
  
      groupBy: function () {
  
          this._builder.groupBy = this._builder.groupBy || [];
  
          if(_.isString(arguments[0])){
              this._builder.groupBy.push(
                  {
                      column: arguments[0],
                      order: arguments[1] || false
                  }
              );
          }
  
          return this;
      },
  
      getGroupBy: function(){
          return this._builder.groupBy || [];
      }
  }