code: function (aggId, cmd) {
      var aggregate = '';
      if (dotty.exists(cmd, this.definitions.command.aggregate)) {
        aggregate = dotty.get(cmd, this.definitions.command.aggregate);
      }
  
      var context = '';
      if (dotty.exists(cmd, this.definitions.command.context)) {
        context = dotty.get(cmd, this.definitions.command.context);
      }
  
      return context + aggregate + aggId;
    }
docs: Returns the concatenated id (more unique)
  @param {String}   aggId The passed aggregate id.
  @param {Object}   cmd   The passed command.
  @returns {string}