code: function (cmd, aggregateModel) {
      if (!this.payload || this.payload === '') {
        this.cmdFn(_.cloneDeep(cmd), aggregateModel);
        return;
      }
  
      var payload = dotty.get(cmd, this.payload);
      this.cmdFn(_.cloneDeep(payload), aggregateModel);
    }
docs: Handles the passed command
  @param {Object}         cmd            The command object.
  @param {AggregateModel} aggregateModel The aggregate object.