Proxy model allowing helpers tied to data objects

base-model.ts

import _ from 'lodash';
import { DateTime } from 'luxon';
import moment from 'moment-timezone';

class Base<T> {
  params: T;

  constructor(params: T) {
    this.params = params;
  }

  get id() {
    return this.params.id;
  }

  get category() {
    return this.constructor.category;
  }

  get type() {
    return this.constructor.type;
  }

  get pluralType() {
    return this.constructor.pluralType;
  }

  static get listURL() {
    return '/' + _.compact([this.category, this.pluralType]).join('/');
  }

  static get creatorURL() {
    return (
      '/' + _.compact([this.category, this.pluralType, 'create']).join('/')
    );
  }

  static editorURL(id: string) {
    return (
      '/' + _.compact([this.category, this.pluralType, id, 'edit']).join('/')
    );
  }

  get editorURL() {
    return (
      '/' +
      _.compact([this.category, this.pluralType, this.id, 'edit']).join('/')
    );
  }

  get expiresAt() {
    const { expiration_date } = this.params;

    if (!expiration_date) return '';

    return moment(expiration_date).tz(moment.tz.guess()).fromNow();
  }

  get createdAt() {
    const { created_at: createdAt } = this.params;
    return createdAt ? DateTime.fromSeconds(createdAt) : undefined;
  }

  get updatedAt() {
    const { updated_at: updatedAt } = this.params;
    return updatedAt ? DateTime.fromSeconds(updatedAt) : undefined;
  }

  get lastTimestamp() {
    return !this.updatedAt ? this.createdAt : this.updatedAt;
  }

  patch(properties: Partial<T>) {
    this.params = { ...this.params, ...properties };
  }

  toJSON() {
    return this.params;
  }
}

var proxyHandler = {
  get: function <T>(obj: Base<T>, name: keyof T) {
    return _.isNil(obj.params[name]) ? obj[name] : obj.params[name];
  },

  set: function <T>(obj: Base<T>, name: keyof T, value: any) {
    obj.params[name] = value;
    return true;
  },
};

export default Base;

my-object-def.ts

import Base from './base-model'; // Assuming 'Base' is in the same directory

interface MyObjectParams {
  id: number;
  name: string;
  expiration_date: string;
  // Add other properties as needed
  customer: {
    name: "Ross Nelson"
  }
}

class MyObject extends Base<MyObjectParams> {
  // You can add additional methods or properties specific to MyObject here
  get customerName() {
    return this.params.customer.name
  }
}

usage.ts

const params: MyObjectParams = {
  id: 1,
  name: 'Example',
  expiration_date: '2024-01-31',
};

const myInstance = new MyObject(params);

console.log(myInstance.id); // Accessing the 'id' property
console.log(myInstance.expiresAt); // Accessing the 'expiresAt' method