lux-framework/src/packages/database/change-set/index.js

Build scalable, Node.js-powered REST APIs with almost no code.

// @flow
import type { Model } from '../index';
import entries from '../../../utils/entries';
import mapToObject from '../../../utils/map-to-object';

class ChangeSet extends Map<string, any> {
  isPersisted: boolean;

  constructor(data?: Object = {}): this {
    super(entries(data));

    this.isPersisted = false;

    return this;
  }

  set(key: string, value: mixed): this {
    if (!this.isPersisted) {
      super.set(key, value);
    }

    return this;
  }

  persist(group?: Array<ChangeSet>): this {
    if (group) {
      group.forEach(changeSet => changeSet.unpersist());
    }

    this.isPersisted = true;

    return this;
  }

  unpersist(): this {
    this.isPersisted = false;
    return this;
  }

  applyTo(target: Model): ChangeSet {
    const instance = new ChangeSet(mapToObject(this));

    target.changeSets.unshift(instance);

    return instance;
  }
}

export default ChangeSet;