Ember CLI Mirage Serializer Pagination and Sort

serializer.js

import { JSONAPISerializer } from 'ember-cli-mirage';
import { isArray } from '@ember/array';

export default JSONAPISerializer.extend({
  serialize(response, request) {
    if (isArray(response)) {
      response = sort(response, request);
    }

    let json = JSONAPISerializer.prototype.serialize.apply(this, [response, request]);

    if (isArray(response)) {
      paginate(json, request);
    }

    json.jsonapi = json.jsonapi || { version: '1.0' };
    return json;
  }
});

function paginate(json, request) {
  const pageNumber = request.queryParams['page[number]'];
  const pageSize = request.queryParams['page[size]'];

  if (!pageNumber || !pageSize) {
    return;
  }

  const minIndex = (pageNumber - 1) * pageSize;
  const maxIndex = pageNumber * pageSize;
  const totalRecords = json.data.length;
  json.data = json.data.slice(minIndex, maxIndex);
  json.meta = json.meta || {};
  json.meta.total_pages = json.meta.total_pages || totalRecords / pageSize;
}

function sort(response, request) {
  let sortKey = request.queryParams['sort'];
  if (!sortKey) {
    return response;
  }

  const isDesc = sortKey[0] === '-';

  if (isDesc) {
    sortKey = sortKey.slice(1);
  }

  return response.sort((a, b) => {
    if (isDesc) {
      return b[sortKey].localeCompare(a[sortKey]);
    } else {
      return a[sortKey].localeCompare(b[sortKey]);
    }
  });
}