@arpinum/backend/lib/ddd/object/AggregateRoot.js

Base modules for backend applications

'use strict';

let _ = require('lodash');
let pick = require('lookalike').pick;
let FunctionalError = require('../../tools/error/FunctionalError');

class AggregateRoot {

  constructor(information) {
    if (!information || !information.id) {
      throw new FunctionalError('Entity must have an id');
    }
    _.assign(this, relevantInformation(this));

    function relevantInformation(self) {
      if (self.constructor.relevantKeys) {
        return pick(information, self.constructor.relevantKeys);
      }
      return information;
    }
  }

  pushEvent(event) {
    if (!this._events) {
      this._events = [];
    }
    let aggregateEvent = event.concerningAggregate(this);
    this._events.push(aggregateEvent);
  }

  flushEvents() {
    let events = this._events;
    delete this._events;
    return events || [];
  }
}

module.exports = AggregateRoot;