Application ficture adapter with queryFixtures implementing limits, order and filters (requires momentjs)

application.js

import Ember from 'ember';
import DS from 'ember-data';

function hasOwn(o, p) {
  return {}.hasOwnProperty.call(o, p);
}

function castId(r) {
  return '' + (r && r instanceof DS.Model ? r.get('id') : r);
}

export default DS.FixtureAdapter.extend({
  queryFixtures: function (fixture, query, type) {
    var m, q, res, limit, order, offset, self = this;
    q = Ember.merge({offset: 0, limit: null, order: []}, query);
    limit = q.limit;
    delete q.limit;
    offset = q.offset;
    delete q.offset;
    order = q.order.slice();
    delete q.order;
    res = fixture.filter(function (record) {
      for (var key in q) {
        if (hasOwn(q, key) && self.compareAttr(q[key], record[key], type, key) !== 0) {
          return false;
        }
      }
      return true;
    });
    if (limit) {
      res = res.slice(offset, limit);
    }
    else {
      res = res.slice(offset);
    }
    if (order.length) {
      for (var i = 0; i < order.length; i++) {
        if ((m = order[i].match(/^([^:]+):(desc|asc)$/))) {
          order[i] = {key: m[1], sortAscending: m[2] !== 'desc'};
        }
        else {
          order[i] = {key: order[i], sortAscending: true};
        }
      }
      res = res.sort(function (item1, item2) {
        var d;
        for (var j = 0; j < order.length; j++) {
          if (order[j].sortAscending) {
            d = self.compareAttr(item1[order.key], item2[order.key], type, order.key);
          }
          else {
            d = self.compareAttr(item2[order.key], item1[order.key], type, order.key);
          }
          if (d !== 0) {
            return d;
          }
        }
        return 0;
      });
    }
    return res;
  },

  compareAttr: function (value1, value2, type, attrName) {
    if (attrName === 'id') {
      value1 = castId(value1);
      value2 = castId(value2);
    }
    else {
      var meta = type.metaForProperty(attrName);
      if (meta.isRelationship) {
        if (meta.kind === 'belongsTo') {
          value1 = castId(value1);
          value2 = castId(value2);
        }
        else {
          value1 = (value1 || []).map(castId);
          value2 = (value2 || []).map(castId);
        }
      }
      else if (meta.type === 'date') {
        value1 = +moment(value1);
        value2 = +moment(value2);
      }
      else if (meta.type === 'number') {
        value1 = Number(value1);
        value2 = Number(value2);
      }
    }
    return Ember.compare(value1, value2);
  }
});